sctp_input.c revision 168859
1163953Srrs/*- 2166675Srrs * Copyright (c) 2001-2007, Cisco Systems, Inc. All rights reserved. 3163953Srrs * 4163953Srrs * Redistribution and use in source and binary forms, with or without 5163953Srrs * modification, are permitted provided that the following conditions are met: 6163953Srrs * 7163953Srrs * a) Redistributions of source code must retain the above copyright notice, 8163953Srrs * this list of conditions and the following disclaimer. 9163953Srrs * 10163953Srrs * b) Redistributions in binary form must reproduce the above copyright 11163953Srrs * notice, this list of conditions and the following disclaimer in 12163953Srrs * the documentation and/or other materials provided with the distribution. 13163953Srrs * 14163953Srrs * c) Neither the name of Cisco Systems, Inc. nor the names of its 15163953Srrs * contributors may be used to endorse or promote products derived 16163953Srrs * from this software without specific prior written permission. 17163953Srrs * 18163953Srrs * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19163953Srrs * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20163953Srrs * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21163953Srrs * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22163953Srrs * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23163953Srrs * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24163953Srrs * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25163953Srrs * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26163953Srrs * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27163953Srrs * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28163953Srrs * THE POSSIBILITY OF SUCH DAMAGE. 29163953Srrs */ 30163953Srrs 31163953Srrs/* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 32163953Srrs 33163953Srrs#include <sys/cdefs.h> 34163953Srrs__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 168859 2007-04-19 11:28:43Z rrs $"); 35163953Srrs 36163953Srrs#include <netinet/sctp_os.h> 37163953Srrs#include <netinet/sctp_var.h> 38167598Srrs#include <netinet/sctp_sysctl.h> 39163953Srrs#include <netinet/sctp_pcb.h> 40163953Srrs#include <netinet/sctp_header.h> 41163953Srrs#include <netinet/sctputil.h> 42163953Srrs#include <netinet/sctp_output.h> 43163953Srrs#include <netinet/sctp_input.h> 44163953Srrs#include <netinet/sctp_auth.h> 45163953Srrs#include <netinet/sctp_indata.h> 46163953Srrs#include <netinet/sctp_asconf.h> 47163953Srrs 48163953Srrs 49163953Srrs 50163953Srrs 51163953Srrsstatic void 52163953Srrssctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 53163953Srrs{ 54163953Srrs struct sctp_nets *net; 55163953Srrs 56165220Srrs /* 57165220Srrs * This now not only stops all cookie timers it also stops any INIT 58165220Srrs * timers as well. This will make sure that the timers are stopped 59165220Srrs * in all collision cases. 60165220Srrs */ 61163953Srrs SCTP_TCB_LOCK_ASSERT(stcb); 62163953Srrs TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 63165220Srrs if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 64163953Srrs sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 65163953Srrs stcb->sctp_ep, 66163953Srrs stcb, 67165220Srrs net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 68165220Srrs } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 69165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 70165220Srrs stcb->sctp_ep, 71165220Srrs stcb, 72165220Srrs net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 73163953Srrs } 74163953Srrs } 75163953Srrs} 76163953Srrs 77163953Srrs/* INIT handler */ 78163953Srrsstatic void 79163953Srrssctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 80163953Srrs struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 81168299Srrs struct sctp_nets *net, int *abort_no_unlock) 82163953Srrs{ 83163953Srrs struct sctp_init *init; 84163953Srrs struct mbuf *op_err; 85163953Srrs uint32_t init_limit; 86163953Srrs 87163953Srrs#ifdef SCTP_DEBUG 88163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 89163953Srrs printf("sctp_handle_init: handling INIT tcb:%p\n", stcb); 90163953Srrs } 91163953Srrs#endif 92163953Srrs op_err = NULL; 93163953Srrs init = &cp->init; 94163953Srrs /* First are we accepting? */ 95163953Srrs if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 96163953Srrs#ifdef SCTP_DEBUG 97163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 98163953Srrs printf("sctp_handle_init: Abort, so_qlimit:%d\n", inp->sctp_socket->so_qlimit); 99163953Srrs } 100163953Srrs#endif 101163953Srrs /* 102163953Srrs * FIX ME ?? What about TCP model and we have a 103163953Srrs * match/restart case? 104163953Srrs */ 105163953Srrs sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 106168299Srrs if (stcb) 107168299Srrs *abort_no_unlock = 1; 108163953Srrs return; 109163953Srrs } 110163953Srrs if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 111163953Srrs /* Invalid length */ 112163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 113163953Srrs sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 114168299Srrs if (stcb) 115168299Srrs *abort_no_unlock = 1; 116163953Srrs return; 117163953Srrs } 118163953Srrs /* validate parameters */ 119163953Srrs if (init->initiate_tag == 0) { 120163953Srrs /* protocol error... send abort */ 121163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 122163953Srrs sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 123168299Srrs if (stcb) 124168299Srrs *abort_no_unlock = 1; 125163953Srrs return; 126163953Srrs } 127163953Srrs if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 128163953Srrs /* invalid parameter... send abort */ 129163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 130163953Srrs sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 131163953Srrs return; 132163953Srrs } 133163953Srrs if (init->num_inbound_streams == 0) { 134163953Srrs /* protocol error... send abort */ 135163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 136163953Srrs sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 137168299Srrs if (stcb) 138168299Srrs *abort_no_unlock = 1; 139163953Srrs return; 140163953Srrs } 141163953Srrs if (init->num_outbound_streams == 0) { 142163953Srrs /* protocol error... send abort */ 143163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 144163953Srrs sctp_abort_association(inp, stcb, m, iphlen, sh, op_err); 145168299Srrs if (stcb) 146168299Srrs *abort_no_unlock = 1; 147163953Srrs return; 148163953Srrs } 149163953Srrs init_limit = offset + ntohs(cp->ch.chunk_length); 150163953Srrs if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 151163953Srrs init_limit)) { 152163953Srrs /* auth parameter(s) error... send abort */ 153163953Srrs sctp_abort_association(inp, stcb, m, iphlen, sh, NULL); 154168299Srrs if (stcb) 155168299Srrs *abort_no_unlock = 1; 156163953Srrs return; 157163953Srrs } 158163953Srrs /* send an INIT-ACK w/cookie */ 159163953Srrs#ifdef SCTP_DEBUG 160163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 161163953Srrs printf("sctp_handle_init: sending INIT-ACK\n"); 162163953Srrs } 163163953Srrs#endif 164163953Srrs sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp); 165163953Srrs} 166163953Srrs 167163953Srrs/* 168163953Srrs * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 169163953Srrs */ 170163953Srrsstatic int 171163953Srrssctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 172163953Srrs struct sctp_nets *net) 173163953Srrs{ 174163953Srrs struct sctp_init *init; 175163953Srrs struct sctp_association *asoc; 176163953Srrs struct sctp_nets *lnet; 177163953Srrs unsigned int i; 178163953Srrs 179163953Srrs init = &cp->init; 180163953Srrs asoc = &stcb->asoc; 181163953Srrs /* save off parameters */ 182163953Srrs asoc->peer_vtag = ntohl(init->initiate_tag); 183163953Srrs asoc->peers_rwnd = ntohl(init->a_rwnd); 184163953Srrs if (TAILQ_FIRST(&asoc->nets)) { 185163953Srrs /* update any ssthresh's that may have a default */ 186163953Srrs TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 187163953Srrs lnet->ssthresh = asoc->peers_rwnd; 188163953Srrs 189163953Srrs#if defined(SCTP_CWND_MONITOR) || defined(SCTP_CWND_LOGGING) 190163953Srrs sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 191163953Srrs#endif 192163953Srrs 193163953Srrs } 194163953Srrs } 195164181Srrs SCTP_TCB_SEND_LOCK(stcb); 196163953Srrs if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 197163953Srrs unsigned int newcnt; 198163953Srrs struct sctp_stream_out *outs; 199163953Srrs struct sctp_stream_queue_pending *sp; 200163953Srrs 201163953Srrs /* cut back on number of streams */ 202163953Srrs newcnt = ntohs(init->num_inbound_streams); 203163953Srrs /* This if is probably not needed but I am cautious */ 204163953Srrs if (asoc->strmout) { 205163953Srrs /* First make sure no data chunks are trapped */ 206163953Srrs for (i = newcnt; i < asoc->pre_open_streams; i++) { 207163953Srrs outs = &asoc->strmout[i]; 208163953Srrs sp = TAILQ_FIRST(&outs->outqueue); 209163953Srrs while (sp) { 210163953Srrs TAILQ_REMOVE(&outs->outqueue, sp, 211163953Srrs next); 212163953Srrs asoc->stream_queue_cnt--; 213163953Srrs sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 214163953Srrs stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 215163953Srrs sp); 216163953Srrs if (sp->data) { 217163953Srrs sctp_m_freem(sp->data); 218163953Srrs sp->data = NULL; 219163953Srrs } 220163953Srrs sctp_free_remote_addr(sp->net); 221163953Srrs sp->net = NULL; 222163953Srrs /* Free the chunk */ 223163964Srrs printf("sp:%p tcb:%p weird free case\n", 224163979Sru sp, stcb); 225163953Srrs 226163953Srrs sctp_free_a_strmoq(stcb, sp); 227163953Srrs sp = TAILQ_FIRST(&outs->outqueue); 228163953Srrs } 229163953Srrs } 230163953Srrs } 231163953Srrs /* cut back the count and abandon the upper streams */ 232163953Srrs asoc->pre_open_streams = newcnt; 233163953Srrs } 234164181Srrs SCTP_TCB_SEND_UNLOCK(stcb); 235163953Srrs asoc->streamoutcnt = asoc->pre_open_streams; 236163953Srrs /* init tsn's */ 237163953Srrs asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 238163953Srrs#ifdef SCTP_MAP_LOGGING 239163953Srrs sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 240163953Srrs#endif 241163953Srrs /* This is the next one we expect */ 242163953Srrs asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 243163953Srrs 244163953Srrs asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 245163953Srrs asoc->cumulative_tsn = asoc->asconf_seq_in; 246163953Srrs asoc->last_echo_tsn = asoc->asconf_seq_in; 247163953Srrs asoc->advanced_peer_ack_point = asoc->last_acked_seq; 248163953Srrs /* open the requested streams */ 249163953Srrs if (asoc->strmin != NULL) { 250163953Srrs /* Free the old ones */ 251164181Srrs struct sctp_queued_to_read *ctl; 252164181Srrs 253164181Srrs for (i = 0; i < asoc->streamincnt; i++) { 254164181Srrs ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 255164181Srrs while (ctl) { 256164181Srrs TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 257164181Srrs sctp_free_remote_addr(ctl->whoFrom); 258164181Srrs sctp_m_freem(ctl->data); 259164181Srrs ctl->data = NULL; 260164181Srrs sctp_free_a_readq(stcb, ctl); 261164181Srrs ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 262164181Srrs } 263164181Srrs } 264163953Srrs SCTP_FREE(asoc->strmin); 265163953Srrs } 266164181Srrs asoc->streamincnt = ntohs(init->num_outbound_streams); 267164181Srrs if (asoc->streamincnt > MAX_SCTP_STREAMS) { 268164181Srrs asoc->streamincnt = MAX_SCTP_STREAMS; 269164181Srrs } 270163953Srrs SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 271163953Srrs sizeof(struct sctp_stream_in), "StreamsIn"); 272163953Srrs if (asoc->strmin == NULL) { 273163953Srrs /* we didn't get memory for the streams! */ 274163953Srrs#ifdef SCTP_DEBUG 275163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 276163953Srrs printf("process_init: couldn't get memory for the streams!\n"); 277163953Srrs } 278163953Srrs#endif 279163953Srrs return (-1); 280163953Srrs } 281163953Srrs for (i = 0; i < asoc->streamincnt; i++) { 282163953Srrs asoc->strmin[i].stream_no = i; 283163953Srrs asoc->strmin[i].last_sequence_delivered = 0xffff; 284163953Srrs /* 285163953Srrs * U-stream ranges will be set when the cookie is unpacked. 286163953Srrs * Or for the INIT sender they are un set (if pr-sctp not 287163953Srrs * supported) when the INIT-ACK arrives. 288163953Srrs */ 289163953Srrs TAILQ_INIT(&asoc->strmin[i].inqueue); 290163953Srrs /* 291163953Srrs * we are not on any wheel, pr-sctp streams will go on the 292163953Srrs * wheel when they have data waiting for reorder. 293163953Srrs */ 294163953Srrs asoc->strmin[i].next_spoke.tqe_next = 0; 295163953Srrs asoc->strmin[i].next_spoke.tqe_prev = 0; 296163953Srrs } 297163953Srrs 298163953Srrs /* 299163953Srrs * load_address_from_init will put the addresses into the 300163953Srrs * association when the COOKIE is processed or the INIT-ACK is 301163953Srrs * processed. Both types of COOKIE's existing and new call this 302163953Srrs * routine. It will remove addresses that are no longer in the 303163953Srrs * association (for the restarting case where addresses are 304163953Srrs * removed). Up front when the INIT arrives we will discard it if it 305163953Srrs * is a restart and new addresses have been added. 306163953Srrs */ 307163953Srrs return (0); 308163953Srrs} 309163953Srrs 310163953Srrs/* 311163953Srrs * INIT-ACK message processing/consumption returns value < 0 on error 312163953Srrs */ 313163953Srrsstatic int 314163953Srrssctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 315163953Srrs struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 316168299Srrs struct sctp_nets *net, int *abort_no_unlock) 317163953Srrs{ 318163953Srrs struct sctp_association *asoc; 319163953Srrs struct mbuf *op_err; 320163953Srrs int retval, abort_flag; 321163953Srrs uint32_t initack_limit; 322163953Srrs 323163953Srrs /* First verify that we have no illegal param's */ 324163953Srrs abort_flag = 0; 325163953Srrs op_err = NULL; 326163953Srrs 327163953Srrs op_err = sctp_arethere_unrecognized_parameters(m, 328163953Srrs (offset + sizeof(struct sctp_init_chunk)), 329163953Srrs &abort_flag, (struct sctp_chunkhdr *)cp); 330163953Srrs if (abort_flag) { 331163953Srrs /* Send an abort and notify peer */ 332163953Srrs if (op_err != NULL) { 333163953Srrs sctp_send_operr_to(m, iphlen, op_err, cp->init.initiate_tag); 334163953Srrs } else { 335163953Srrs /* 336163953Srrs * Just notify (abort_assoc does this if we send an 337163953Srrs * abort). 338163953Srrs */ 339163953Srrs sctp_abort_notification(stcb, 0); 340163953Srrs /* 341163953Srrs * No sense in further INIT's since we will get the 342163953Srrs * same param back 343163953Srrs */ 344165220Srrs sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 345168299Srrs *abort_no_unlock = 1; 346163953Srrs } 347163953Srrs return (-1); 348163953Srrs } 349163953Srrs asoc = &stcb->asoc; 350163953Srrs /* process the peer's parameters in the INIT-ACK */ 351163953Srrs retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 352163953Srrs if (retval < 0) { 353163953Srrs return (retval); 354163953Srrs } 355163953Srrs initack_limit = offset + ntohs(cp->ch.chunk_length); 356163953Srrs /* load all addresses */ 357163953Srrs if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 358163953Srrs (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 359163953Srrs NULL))) { 360163953Srrs /* Huh, we should abort */ 361163953Srrs#ifdef SCTP_DEBUG 362163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 363163953Srrs printf("Load addresses from INIT causes an abort %d\n", retval); 364163953Srrs } 365163953Srrs#endif 366163953Srrs sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 367163953Srrs NULL); 368168299Srrs *abort_no_unlock = 1; 369163953Srrs return (-1); 370163953Srrs } 371163953Srrs stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 372163953Srrs stcb->asoc.local_hmacs); 373163953Srrs if (op_err) { 374163953Srrs sctp_queue_op_err(stcb, op_err); 375163953Srrs /* queuing will steal away the mbuf chain to the out queue */ 376163953Srrs op_err = NULL; 377163953Srrs } 378163953Srrs /* extract the cookie and queue it to "echo" it back... */ 379163953Srrs stcb->asoc.overall_error_count = 0; 380163953Srrs net->error_count = 0; 381163953Srrs 382163953Srrs /* 383163953Srrs * Cancel the INIT timer, We do this first before queueing the 384163953Srrs * cookie. We always cancel at the primary to assue that we are 385163953Srrs * canceling the timer started by the INIT which always goes to the 386163953Srrs * primary. 387163953Srrs */ 388163953Srrs sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 389165220Srrs asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 390163953Srrs 391165220Srrs /* calculate the RTO */ 392165220Srrs net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered); 393165220Srrs 394163953Srrs retval = sctp_send_cookie_echo(m, offset, stcb, net); 395163953Srrs if (retval < 0) { 396163953Srrs /* 397163953Srrs * No cookie, we probably should send a op error. But in any 398163953Srrs * case if there is no cookie in the INIT-ACK, we can 399163953Srrs * abandon the peer, its broke. 400163953Srrs */ 401163953Srrs if (retval == -3) { 402163953Srrs /* We abort with an error of missing mandatory param */ 403163953Srrs struct mbuf *op_err; 404163953Srrs 405163953Srrs op_err = 406163953Srrs sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 407163953Srrs if (op_err) { 408163953Srrs /* 409163953Srrs * Expand beyond to include the mandatory 410163953Srrs * param cookie 411163953Srrs */ 412163953Srrs struct sctp_inv_mandatory_param *mp; 413163953Srrs 414165647Srrs SCTP_BUF_LEN(op_err) = 415163953Srrs sizeof(struct sctp_inv_mandatory_param); 416163953Srrs mp = mtod(op_err, 417163953Srrs struct sctp_inv_mandatory_param *); 418163953Srrs /* Subtract the reserved param */ 419163953Srrs mp->length = 420163953Srrs htons(sizeof(struct sctp_inv_mandatory_param) - 2); 421163953Srrs mp->num_param = htonl(1); 422163953Srrs mp->param = htons(SCTP_STATE_COOKIE); 423163953Srrs mp->resv = 0; 424163953Srrs } 425163953Srrs sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 426163953Srrs sh, op_err); 427168299Srrs *abort_no_unlock = 1; 428163953Srrs } 429163953Srrs return (retval); 430163953Srrs } 431163953Srrs return (0); 432163953Srrs} 433163953Srrs 434163953Srrsstatic void 435163953Srrssctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 436163953Srrs struct sctp_tcb *stcb, struct sctp_nets *net) 437163953Srrs{ 438163953Srrs struct sockaddr_storage store; 439163953Srrs struct sockaddr_in *sin; 440163953Srrs struct sockaddr_in6 *sin6; 441163953Srrs struct sctp_nets *r_net; 442163953Srrs struct timeval tv; 443163953Srrs 444163953Srrs if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 445163953Srrs /* Invalid length */ 446163953Srrs return; 447163953Srrs } 448163953Srrs sin = (struct sockaddr_in *)&store; 449163953Srrs sin6 = (struct sockaddr_in6 *)&store; 450163953Srrs 451163953Srrs memset(&store, 0, sizeof(store)); 452163953Srrs if (cp->heartbeat.hb_info.addr_family == AF_INET && 453163953Srrs cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 454163953Srrs sin->sin_family = cp->heartbeat.hb_info.addr_family; 455163953Srrs sin->sin_len = cp->heartbeat.hb_info.addr_len; 456163953Srrs sin->sin_port = stcb->rport; 457163953Srrs memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 458163953Srrs sizeof(sin->sin_addr)); 459163953Srrs } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 460163953Srrs cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 461163953Srrs sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 462163953Srrs sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 463163953Srrs sin6->sin6_port = stcb->rport; 464163953Srrs memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 465163953Srrs sizeof(sin6->sin6_addr)); 466163953Srrs } else { 467163953Srrs return; 468163953Srrs } 469163953Srrs r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 470163953Srrs if (r_net == NULL) { 471163953Srrs#ifdef SCTP_DEBUG 472163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 473163953Srrs printf("Huh? I can't find the address I sent it to, discard\n"); 474163953Srrs } 475163953Srrs#endif 476163953Srrs return; 477163953Srrs } 478163953Srrs if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 479163953Srrs (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 480163953Srrs (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 481163953Srrs /* 482163953Srrs * If the its a HB and it's random value is correct when can 483163953Srrs * confirm the destination. 484163953Srrs */ 485163953Srrs r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 486167598Srrs if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 487167598Srrs stcb->asoc.primary_destination = r_net; 488167598Srrs r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 489167598Srrs r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 490167598Srrs r_net = TAILQ_FIRST(&stcb->asoc.nets); 491167598Srrs if (r_net != stcb->asoc.primary_destination) { 492167598Srrs /* 493167598Srrs * first one on the list is NOT the primary 494167598Srrs * sctp_cmpaddr() is much more efficent if 495167598Srrs * the primary is the first on the list, 496167598Srrs * make it so. 497167598Srrs */ 498167598Srrs TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 499167598Srrs TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 500167598Srrs } 501167598Srrs } 502163953Srrs sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 503163953Srrs stcb, 0, (void *)r_net); 504163953Srrs } 505163953Srrs r_net->error_count = 0; 506163953Srrs r_net->hb_responded = 1; 507163953Srrs tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 508163953Srrs tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 509163953Srrs if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 510163953Srrs r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 511163953Srrs r_net->dest_state |= SCTP_ADDR_REACHABLE; 512163953Srrs sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 513163953Srrs SCTP_HEARTBEAT_SUCCESS, (void *)r_net); 514163953Srrs /* now was it the primary? if so restore */ 515163953Srrs if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 516163953Srrs sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 517163953Srrs } 518163953Srrs } 519163953Srrs /* Now lets do a RTO with this */ 520163953Srrs r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv); 521163953Srrs} 522163953Srrs 523163953Srrsstatic void 524163953Srrssctp_handle_abort(struct sctp_abort_chunk *cp, 525163953Srrs struct sctp_tcb *stcb, struct sctp_nets *net) 526163953Srrs{ 527163953Srrs 528163953Srrs#ifdef SCTP_DEBUG 529163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 530163953Srrs printf("sctp_handle_abort: handling ABORT\n"); 531163953Srrs } 532163953Srrs#endif 533163953Srrs if (stcb == NULL) 534163953Srrs return; 535163953Srrs /* verify that the destination addr is in the association */ 536163953Srrs /* ignore abort for addresses being deleted */ 537163953Srrs 538163953Srrs /* stop any receive timers */ 539165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 540163953Srrs /* notify user of the abort and clean up... */ 541163953Srrs sctp_abort_notification(stcb, 0); 542163953Srrs /* free the tcb */ 543163953Srrs SCTP_STAT_INCR_COUNTER32(sctps_aborted); 544163953Srrs if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 545163953Srrs (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 546163953Srrs SCTP_STAT_DECR_GAUGE32(sctps_currestab); 547163953Srrs } 548168859Srrs#ifdef SCTP_ASOCLOG_OF_TSNS 549168859Srrs sctp_print_out_track_log(stcb); 550168859Srrs#endif 551165220Srrs sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 552163953Srrs#ifdef SCTP_DEBUG 553163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 554163953Srrs printf("sctp_handle_abort: finished\n"); 555163953Srrs } 556163953Srrs#endif 557163953Srrs} 558163953Srrs 559163953Srrsstatic void 560163953Srrssctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 561163953Srrs struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 562163953Srrs{ 563163953Srrs struct sctp_association *asoc; 564163953Srrs int some_on_streamwheel; 565163953Srrs 566163953Srrs#ifdef SCTP_DEBUG 567163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 568163953Srrs printf("sctp_handle_shutdown: handling SHUTDOWN\n"); 569163953Srrs } 570163953Srrs#endif 571163953Srrs if (stcb == NULL) 572163953Srrs return; 573165220Srrs asoc = &stcb->asoc; 574165220Srrs if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 575165220Srrs (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 576163953Srrs return; 577163953Srrs } 578163953Srrs if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 579163953Srrs /* Shutdown NOT the expected size */ 580163953Srrs return; 581163953Srrs } else { 582163953Srrs sctp_update_acked(stcb, cp, net, abort_flag); 583163953Srrs } 584165220Srrs if (asoc->control_pdapi) { 585163953Srrs /* 586163953Srrs * With a normal shutdown we assume the end of last record. 587163953Srrs */ 588163953Srrs SCTP_INP_READ_LOCK(stcb->sctp_ep); 589165220Srrs asoc->control_pdapi->end_added = 1; 590165220Srrs asoc->control_pdapi->pdapi_aborted = 1; 591165220Srrs asoc->control_pdapi = NULL; 592163953Srrs SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 593163996Srrs sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 594163953Srrs } 595163953Srrs /* goto SHUTDOWN_RECEIVED state to block new requests */ 596163953Srrs if (stcb->sctp_socket) { 597163953Srrs if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 598163953Srrs (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 599163953Srrs asoc->state = SCTP_STATE_SHUTDOWN_RECEIVED; 600163953Srrs /* 601163953Srrs * notify upper layer that peer has initiated a 602163953Srrs * shutdown 603163953Srrs */ 604163953Srrs sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL); 605163953Srrs 606163953Srrs /* reset time */ 607163953Srrs SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 608163953Srrs } 609163953Srrs } 610163953Srrs if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 611163953Srrs /* 612163953Srrs * stop the shutdown timer, since we WILL move to 613163953Srrs * SHUTDOWN-ACK-SENT. 614163953Srrs */ 615165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 616163953Srrs } 617163953Srrs /* Now are we there yet? */ 618163953Srrs some_on_streamwheel = 0; 619163953Srrs if (!TAILQ_EMPTY(&asoc->out_wheel)) { 620163953Srrs /* Check to see if some data queued */ 621163953Srrs struct sctp_stream_out *outs; 622163953Srrs 623163953Srrs TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) { 624163953Srrs if (!TAILQ_EMPTY(&outs->outqueue)) { 625163953Srrs some_on_streamwheel = 1; 626163953Srrs break; 627163953Srrs } 628163953Srrs } 629163953Srrs } 630163953Srrs if (!TAILQ_EMPTY(&asoc->send_queue) || 631163953Srrs !TAILQ_EMPTY(&asoc->sent_queue) || 632163953Srrs some_on_streamwheel) { 633163953Srrs /* By returning we will push more data out */ 634163953Srrs return; 635163953Srrs } else { 636163953Srrs /* no outstanding data to send, so move on... */ 637163953Srrs /* send SHUTDOWN-ACK */ 638163953Srrs sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 639163953Srrs /* move to SHUTDOWN-ACK-SENT state */ 640166675Srrs if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 641166675Srrs (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 642163953Srrs SCTP_STAT_DECR_GAUGE32(sctps_currestab); 643163953Srrs } 644163953Srrs asoc->state = SCTP_STATE_SHUTDOWN_ACK_SENT; 645163953Srrs 646163953Srrs /* start SHUTDOWN timer */ 647163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 648163953Srrs stcb, net); 649163953Srrs } 650163953Srrs} 651163953Srrs 652163953Srrsstatic void 653163953Srrssctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 654163953Srrs struct sctp_tcb *stcb, struct sctp_nets *net) 655163953Srrs{ 656163953Srrs struct sctp_association *asoc; 657163953Srrs 658163953Srrs#ifdef SCTP_DEBUG 659163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 660163953Srrs printf("sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 661163953Srrs } 662163953Srrs#endif 663163953Srrs if (stcb == NULL) 664163953Srrs return; 665163953Srrs 666163953Srrs asoc = &stcb->asoc; 667163953Srrs /* process according to association state */ 668163953Srrs if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 669163953Srrs (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 670163953Srrs /* unexpected SHUTDOWN-ACK... so ignore... */ 671163953Srrs SCTP_TCB_UNLOCK(stcb); 672163953Srrs return; 673163953Srrs } 674165220Srrs if (asoc->control_pdapi) { 675163953Srrs /* 676163953Srrs * With a normal shutdown we assume the end of last record. 677163953Srrs */ 678163953Srrs SCTP_INP_READ_LOCK(stcb->sctp_ep); 679165220Srrs asoc->control_pdapi->end_added = 1; 680165220Srrs asoc->control_pdapi->pdapi_aborted = 1; 681165220Srrs asoc->control_pdapi = NULL; 682163953Srrs SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 683163996Srrs sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 684163953Srrs } 685163953Srrs /* are the queues empty? */ 686163953Srrs if (!TAILQ_EMPTY(&asoc->send_queue) || 687163953Srrs !TAILQ_EMPTY(&asoc->sent_queue) || 688163953Srrs !TAILQ_EMPTY(&asoc->out_wheel)) { 689164205Srrs sctp_report_all_outbound(stcb, 0); 690163953Srrs } 691163953Srrs /* stop the timer */ 692165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 693163953Srrs /* send SHUTDOWN-COMPLETE */ 694163953Srrs sctp_send_shutdown_complete(stcb, net); 695163953Srrs /* notify upper layer protocol */ 696163953Srrs if (stcb->sctp_socket) { 697163953Srrs sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 698163953Srrs if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 699163953Srrs (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 700163953Srrs /* Set the connected flag to disconnected */ 701163953Srrs stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 702163953Srrs } 703163953Srrs } 704163953Srrs SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 705163953Srrs /* free the TCB but first save off the ep */ 706165220Srrs sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 707165220Srrs SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 708163953Srrs} 709163953Srrs 710163953Srrs/* 711163953Srrs * Skip past the param header and then we will find the chunk that caused the 712163953Srrs * problem. There are two possiblities ASCONF or FWD-TSN other than that and 713163953Srrs * our peer must be broken. 714163953Srrs */ 715163953Srrsstatic void 716163953Srrssctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 717163953Srrs struct sctp_nets *net) 718163953Srrs{ 719163953Srrs struct sctp_chunkhdr *chk; 720163953Srrs 721163953Srrs chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 722163953Srrs switch (chk->chunk_type) { 723163953Srrs case SCTP_ASCONF_ACK: 724163953Srrs case SCTP_ASCONF: 725163953Srrs sctp_asconf_cleanup(stcb, net); 726163953Srrs break; 727163953Srrs case SCTP_FORWARD_CUM_TSN: 728163953Srrs stcb->asoc.peer_supports_prsctp = 0; 729163953Srrs break; 730163953Srrs default: 731163953Srrs#ifdef SCTP_DEBUG 732163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 733163953Srrs printf("Peer does not support chunk type %d(%x)??\n", 734163953Srrs chk->chunk_type, (uint32_t) chk->chunk_type); 735163953Srrs } 736163953Srrs#endif 737163953Srrs break; 738163953Srrs } 739163953Srrs} 740163953Srrs 741163953Srrs/* 742163953Srrs * Skip past the param header and then we will find the param that caused the 743163953Srrs * problem. There are a number of param's in a ASCONF OR the prsctp param 744163953Srrs * these will turn of specific features. 745163953Srrs */ 746163953Srrsstatic void 747163953Srrssctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 748163953Srrs{ 749163953Srrs struct sctp_paramhdr *pbad; 750163953Srrs 751163953Srrs pbad = phdr + 1; 752163953Srrs switch (ntohs(pbad->param_type)) { 753163953Srrs /* pr-sctp draft */ 754163953Srrs case SCTP_PRSCTP_SUPPORTED: 755163953Srrs stcb->asoc.peer_supports_prsctp = 0; 756163953Srrs break; 757163953Srrs case SCTP_SUPPORTED_CHUNK_EXT: 758163953Srrs break; 759163953Srrs /* draft-ietf-tsvwg-addip-sctp */ 760163953Srrs case SCTP_ECN_NONCE_SUPPORTED: 761163953Srrs stcb->asoc.peer_supports_ecn_nonce = 0; 762163953Srrs stcb->asoc.ecn_nonce_allowed = 0; 763163953Srrs stcb->asoc.ecn_allowed = 0; 764163953Srrs break; 765163953Srrs case SCTP_ADD_IP_ADDRESS: 766163953Srrs case SCTP_DEL_IP_ADDRESS: 767163953Srrs case SCTP_SET_PRIM_ADDR: 768163953Srrs stcb->asoc.peer_supports_asconf = 0; 769163953Srrs break; 770163953Srrs case SCTP_SUCCESS_REPORT: 771163953Srrs case SCTP_ERROR_CAUSE_IND: 772163953Srrs#ifdef SCTP_DEBUG 773163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 774163953Srrs printf("Huh, the peer does not support success? or error cause?\n"); 775163953Srrs printf("Turning off ASCONF to this strange peer\n"); 776163953Srrs } 777163953Srrs#endif 778163953Srrs stcb->asoc.peer_supports_asconf = 0; 779163953Srrs break; 780163953Srrs default: 781163953Srrs#ifdef SCTP_DEBUG 782163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 783163953Srrs printf("Peer does not support param type %d(%x)??\n", 784163953Srrs pbad->param_type, (uint32_t) pbad->param_type); 785163953Srrs } 786163953Srrs#endif 787163953Srrs break; 788163953Srrs } 789163953Srrs} 790163953Srrs 791163953Srrsstatic int 792163953Srrssctp_handle_error(struct sctp_chunkhdr *ch, 793163953Srrs struct sctp_tcb *stcb, struct sctp_nets *net) 794163953Srrs{ 795163953Srrs int chklen; 796163953Srrs struct sctp_paramhdr *phdr; 797163953Srrs uint16_t error_type; 798163953Srrs uint16_t error_len; 799163953Srrs struct sctp_association *asoc; 800163953Srrs 801163953Srrs int adjust; 802163953Srrs 803163953Srrs /* parse through all of the errors and process */ 804163953Srrs asoc = &stcb->asoc; 805163953Srrs phdr = (struct sctp_paramhdr *)((caddr_t)ch + 806163953Srrs sizeof(struct sctp_chunkhdr)); 807163953Srrs chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 808163953Srrs while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 809163953Srrs /* Process an Error Cause */ 810163953Srrs error_type = ntohs(phdr->param_type); 811163953Srrs error_len = ntohs(phdr->param_length); 812163953Srrs if ((error_len > chklen) || (error_len == 0)) { 813163953Srrs /* invalid param length for this param */ 814163953Srrs#ifdef SCTP_DEBUG 815163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 816163953Srrs printf("Bogus length in error param- chunk left:%d errorlen:%d\n", 817163953Srrs chklen, error_len); 818163953Srrs } 819163953Srrs#endif /* SCTP_DEBUG */ 820163953Srrs return (0); 821163953Srrs } 822163953Srrs switch (error_type) { 823163953Srrs case SCTP_CAUSE_INVALID_STREAM: 824163953Srrs case SCTP_CAUSE_MISSING_PARAM: 825163953Srrs case SCTP_CAUSE_INVALID_PARAM: 826163953Srrs case SCTP_CAUSE_NO_USER_DATA: 827163953Srrs#ifdef SCTP_DEBUG 828163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 829163953Srrs printf("Software error we got a %d back? We have a bug :/ (or do they?)\n", 830163953Srrs error_type); 831163953Srrs } 832163953Srrs#endif 833163953Srrs break; 834163953Srrs case SCTP_CAUSE_STALE_COOKIE: 835163953Srrs /* 836163953Srrs * We only act if we have echoed a cookie and are 837163953Srrs * waiting. 838163953Srrs */ 839163953Srrs if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 840163953Srrs int *p; 841163953Srrs 842163953Srrs p = (int *)((caddr_t)phdr + sizeof(*phdr)); 843163953Srrs /* Save the time doubled */ 844163953Srrs asoc->cookie_preserve_req = ntohl(*p) << 1; 845163953Srrs asoc->stale_cookie_count++; 846163953Srrs if (asoc->stale_cookie_count > 847163953Srrs asoc->max_init_times) { 848163953Srrs sctp_abort_notification(stcb, 0); 849163953Srrs /* now free the asoc */ 850165220Srrs sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 851163953Srrs return (-1); 852163953Srrs } 853163953Srrs /* blast back to INIT state */ 854163953Srrs asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 855163953Srrs asoc->state |= SCTP_STATE_COOKIE_WAIT; 856163953Srrs 857163953Srrs sctp_stop_all_cookie_timers(stcb); 858163953Srrs sctp_send_initiate(stcb->sctp_ep, stcb); 859163953Srrs } 860163953Srrs break; 861163953Srrs case SCTP_CAUSE_UNRESOLVABLE_ADDR: 862163953Srrs /* 863163953Srrs * Nothing we can do here, we don't do hostname 864163953Srrs * addresses so if the peer does not like my IPv6 865163953Srrs * (or IPv4 for that matter) it does not matter. If 866163953Srrs * they don't support that type of address, they can 867163953Srrs * NOT possibly get that packet type... i.e. with no 868163953Srrs * IPv6 you can't recieve a IPv6 packet. so we can 869163953Srrs * safely ignore this one. If we ever added support 870163953Srrs * for HOSTNAME Addresses, then we would need to do 871163953Srrs * something here. 872163953Srrs */ 873163953Srrs break; 874163953Srrs case SCTP_CAUSE_UNRECOG_CHUNK: 875163953Srrs sctp_process_unrecog_chunk(stcb, phdr, net); 876163953Srrs break; 877163953Srrs case SCTP_CAUSE_UNRECOG_PARAM: 878163953Srrs sctp_process_unrecog_param(stcb, phdr); 879163953Srrs break; 880163953Srrs case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 881163953Srrs /* 882163953Srrs * We ignore this since the timer will drive out a 883163953Srrs * new cookie anyway and there timer will drive us 884163953Srrs * to send a SHUTDOWN_COMPLETE. We can't send one 885163953Srrs * here since we don't have their tag. 886163953Srrs */ 887163953Srrs break; 888163953Srrs case SCTP_CAUSE_DELETING_LAST_ADDR: 889163953Srrs case SCTP_CAUSE_RESOURCE_SHORTAGE: 890163953Srrs case SCTP_CAUSE_DELETING_SRC_ADDR: 891163953Srrs /* 892163953Srrs * We should NOT get these here, but in a 893166086Srrs * ASCONF-ACK. 894163953Srrs */ 895163953Srrs#ifdef SCTP_DEBUG 896163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 897163953Srrs printf("Peer sends ASCONF errors in a Operational Error?<%d>?\n", 898163953Srrs error_type); 899163953Srrs } 900163953Srrs#endif 901163953Srrs break; 902163953Srrs case SCTP_CAUSE_OUT_OF_RESC: 903163953Srrs /* 904163953Srrs * And what, pray tell do we do with the fact that 905163953Srrs * the peer is out of resources? Not really sure we 906166086Srrs * could do anything but abort. I suspect this 907163953Srrs * should have came WITH an abort instead of in a 908163953Srrs * OP-ERROR. 909163953Srrs */ 910163953Srrs break; 911163953Srrs default: 912163953Srrs#ifdef SCTP_DEBUG 913163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 914163953Srrs /* don't know what this error cause is... */ 915163953Srrs printf("sctp_handle_error: unknown error type = 0x%xh\n", 916163953Srrs error_type); 917163953Srrs } 918163953Srrs#endif /* SCTP_DEBUG */ 919163953Srrs break; 920163953Srrs } 921163953Srrs adjust = SCTP_SIZE32(error_len); 922163953Srrs chklen -= adjust; 923163953Srrs phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 924163953Srrs } 925163953Srrs return (0); 926163953Srrs} 927163953Srrs 928163953Srrsstatic int 929163953Srrssctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 930163953Srrs struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 931168299Srrs struct sctp_nets *net, int *abort_no_unlock) 932163953Srrs{ 933163953Srrs struct sctp_init_ack *init_ack; 934163953Srrs int *state; 935163953Srrs struct mbuf *op_err; 936163953Srrs 937163953Srrs#ifdef SCTP_DEBUG 938163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 939163953Srrs printf("sctp_handle_init_ack: handling INIT-ACK\n"); 940163953Srrs } 941163953Srrs#endif 942163953Srrs if (stcb == NULL) { 943163953Srrs#ifdef SCTP_DEBUG 944163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 945163953Srrs printf("sctp_handle_init_ack: TCB is null\n"); 946163953Srrs } 947163953Srrs#endif 948163953Srrs return (-1); 949163953Srrs } 950163953Srrs if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 951163953Srrs /* Invalid length */ 952163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 953163953Srrs sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 954163953Srrs op_err); 955168299Srrs *abort_no_unlock = 1; 956163953Srrs return (-1); 957163953Srrs } 958163953Srrs init_ack = &cp->init; 959163953Srrs /* validate parameters */ 960163953Srrs if (init_ack->initiate_tag == 0) { 961163953Srrs /* protocol error... send an abort */ 962163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 963163953Srrs sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 964163953Srrs op_err); 965168299Srrs *abort_no_unlock = 1; 966163953Srrs return (-1); 967163953Srrs } 968163953Srrs if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 969163953Srrs /* protocol error... send an abort */ 970163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 971163953Srrs sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 972163953Srrs op_err); 973168299Srrs *abort_no_unlock = 1; 974163953Srrs return (-1); 975163953Srrs } 976163953Srrs if (init_ack->num_inbound_streams == 0) { 977163953Srrs /* protocol error... send an abort */ 978163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 979163953Srrs sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 980163953Srrs op_err); 981168299Srrs *abort_no_unlock = 1; 982163953Srrs return (-1); 983163953Srrs } 984163953Srrs if (init_ack->num_outbound_streams == 0) { 985163953Srrs /* protocol error... send an abort */ 986163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 987163953Srrs sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 988163953Srrs op_err); 989168299Srrs *abort_no_unlock = 1; 990163953Srrs return (-1); 991163953Srrs } 992163953Srrs /* process according to association state... */ 993163953Srrs state = &stcb->asoc.state; 994163953Srrs switch (*state & SCTP_STATE_MASK) { 995163953Srrs case SCTP_STATE_COOKIE_WAIT: 996163953Srrs /* this is the expected state for this chunk */ 997163953Srrs /* process the INIT-ACK parameters */ 998163953Srrs if (stcb->asoc.primary_destination->dest_state & 999163953Srrs SCTP_ADDR_UNCONFIRMED) { 1000163953Srrs /* 1001163953Srrs * The primary is where we sent the INIT, we can 1002163953Srrs * always consider it confirmed when the INIT-ACK is 1003163953Srrs * returned. Do this before we load addresses 1004163953Srrs * though. 1005163953Srrs */ 1006163953Srrs stcb->asoc.primary_destination->dest_state &= 1007163953Srrs ~SCTP_ADDR_UNCONFIRMED; 1008163953Srrs sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1009163953Srrs stcb, 0, (void *)stcb->asoc.primary_destination); 1010163953Srrs } 1011168299Srrs if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, net, 1012168299Srrs abort_no_unlock) < 0) { 1013163953Srrs /* error in parsing parameters */ 1014163953Srrs return (-1); 1015163953Srrs } 1016163953Srrs /* update our state */ 1017163953Srrs#ifdef SCTP_DEBUG 1018163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 1019163953Srrs printf("moving to COOKIE-ECHOED state\n"); 1020163953Srrs } 1021163953Srrs#endif 1022163953Srrs if (*state & SCTP_STATE_SHUTDOWN_PENDING) { 1023163953Srrs *state = SCTP_STATE_COOKIE_ECHOED | 1024163953Srrs SCTP_STATE_SHUTDOWN_PENDING; 1025163953Srrs } else { 1026163953Srrs *state = SCTP_STATE_COOKIE_ECHOED; 1027163953Srrs } 1028163953Srrs 1029163953Srrs /* reset the RTO calc */ 1030163953Srrs stcb->asoc.overall_error_count = 0; 1031163953Srrs SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1032163953Srrs /* 1033163953Srrs * collapse the init timer back in case of a exponential 1034165220Srrs * backoff 1035163953Srrs */ 1036163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1037163953Srrs stcb, net); 1038163953Srrs /* 1039163953Srrs * the send at the end of the inbound data processing will 1040163953Srrs * cause the cookie to be sent 1041163953Srrs */ 1042163953Srrs break; 1043163953Srrs case SCTP_STATE_SHUTDOWN_SENT: 1044163953Srrs /* incorrect state... discard */ 1045163953Srrs break; 1046163953Srrs case SCTP_STATE_COOKIE_ECHOED: 1047163953Srrs /* incorrect state... discard */ 1048163953Srrs break; 1049163953Srrs case SCTP_STATE_OPEN: 1050163953Srrs /* incorrect state... discard */ 1051163953Srrs break; 1052163953Srrs case SCTP_STATE_EMPTY: 1053163953Srrs case SCTP_STATE_INUSE: 1054163953Srrs default: 1055163953Srrs /* incorrect state... discard */ 1056163953Srrs return (-1); 1057163953Srrs break; 1058163953Srrs } /* end switch asoc state */ 1059163953Srrs#ifdef SCTP_DEBUG 1060163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1061163953Srrs printf("Leaving handle-init-ack end\n"); 1062163953Srrs } 1063163953Srrs#endif 1064163953Srrs return (0); 1065163953Srrs} 1066163953Srrs 1067163953Srrs 1068163953Srrs/* 1069163953Srrs * handle a state cookie for an existing association m: input packet mbuf 1070163953Srrs * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1071163953Srrs * "split" mbuf and the cookie signature does not exist offset: offset into 1072163953Srrs * mbuf to the cookie-echo chunk 1073163953Srrs */ 1074163953Srrsstatic struct sctp_tcb * 1075163953Srrssctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1076163953Srrs struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1077163953Srrs struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 1078163953Srrs struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id) 1079163953Srrs{ 1080163953Srrs struct sctp_association *asoc; 1081163953Srrs struct sctp_init_chunk *init_cp, init_buf; 1082163953Srrs struct sctp_init_ack_chunk *initack_cp, initack_buf; 1083163953Srrs int chk_length; 1084165220Srrs int init_offset, initack_offset, i; 1085163953Srrs int retval; 1086164205Srrs int spec_flag = 0; 1087166023Srrs int how_indx; 1088163953Srrs 1089163953Srrs /* I know that the TCB is non-NULL from the caller */ 1090163953Srrs asoc = &stcb->asoc; 1091166675Srrs for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1092166023Srrs if (asoc->cookie_how[how_indx] == 0) 1093166023Srrs break; 1094166023Srrs } 1095166023Srrs if (how_indx < sizeof(asoc->cookie_how)) { 1096166023Srrs asoc->cookie_how[how_indx] = 1; 1097166023Srrs } 1098163953Srrs if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1099163953Srrs /* SHUTDOWN came in after sending INIT-ACK */ 1100163953Srrs struct mbuf *op_err; 1101163953Srrs struct sctp_paramhdr *ph; 1102163953Srrs 1103163953Srrs sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1104163953Srrs op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1105165647Srrs 0, M_DONTWAIT, 1, MT_DATA); 1106163953Srrs if (op_err == NULL) { 1107163953Srrs /* FOOBAR */ 1108163953Srrs return (NULL); 1109163953Srrs } 1110163953Srrs /* pre-reserve some space */ 1111165647Srrs SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1112165647Srrs SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1113165647Srrs SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1114163953Srrs /* Set the len */ 1115165647Srrs SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1116163953Srrs ph = mtod(op_err, struct sctp_paramhdr *); 1117163953Srrs ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1118163953Srrs ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1119163953Srrs sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag); 1120166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1121166023Srrs asoc->cookie_how[how_indx] = 2; 1122163953Srrs return (NULL); 1123163953Srrs } 1124163953Srrs /* 1125163953Srrs * find and validate the INIT chunk in the cookie (peer's info) the 1126163953Srrs * INIT should start after the cookie-echo header struct (chunk 1127163953Srrs * header, state cookie header struct) 1128163953Srrs */ 1129163953Srrs init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1130163953Srrs 1131163953Srrs init_cp = (struct sctp_init_chunk *) 1132163953Srrs sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1133163953Srrs (uint8_t *) & init_buf); 1134163953Srrs if (init_cp == NULL) { 1135163953Srrs /* could not pull a INIT chunk in cookie */ 1136163953Srrs return (NULL); 1137163953Srrs } 1138163953Srrs chk_length = ntohs(init_cp->ch.chunk_length); 1139163953Srrs if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1140163953Srrs return (NULL); 1141163953Srrs } 1142163953Srrs /* 1143163953Srrs * find and validate the INIT-ACK chunk in the cookie (my info) the 1144163953Srrs * INIT-ACK follows the INIT chunk 1145163953Srrs */ 1146163953Srrs initack_offset = init_offset + SCTP_SIZE32(chk_length); 1147163953Srrs initack_cp = (struct sctp_init_ack_chunk *) 1148163953Srrs sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1149163953Srrs (uint8_t *) & initack_buf); 1150163953Srrs if (initack_cp == NULL) { 1151163953Srrs /* could not pull INIT-ACK chunk in cookie */ 1152163953Srrs return (NULL); 1153163953Srrs } 1154163953Srrs chk_length = ntohs(initack_cp->ch.chunk_length); 1155163953Srrs if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1156163953Srrs return (NULL); 1157163953Srrs } 1158163953Srrs if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1159163953Srrs (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1160163953Srrs /* 1161163953Srrs * case D in Section 5.2.4 Table 2: MMAA process accordingly 1162163953Srrs * to get into the OPEN state 1163163953Srrs */ 1164166023Srrs if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1165166086Srrs#ifdef INVARIANTS 1166166023Srrs panic("Case D and non-match seq?"); 1167166086Srrs#else 1168166086Srrs printf("Case D, seq non-match %x vs %x?\n", 1169166086Srrs ntohl(initack_cp->init.initial_tsn), asoc->init_seq_number); 1170166086Srrs#endif 1171166023Srrs } 1172163953Srrs switch SCTP_GET_STATE 1173163953Srrs (asoc) { 1174163953Srrs case SCTP_STATE_COOKIE_WAIT: 1175166023Srrs case SCTP_STATE_COOKIE_ECHOED: 1176163953Srrs /* 1177163953Srrs * INIT was sent, but got got a COOKIE_ECHO with the 1178166023Srrs * correct tags... just accept it...but we must 1179166023Srrs * process the init so that we can make sure we have 1180166023Srrs * the right seq no's. 1181163953Srrs */ 1182163953Srrs /* First we must process the INIT !! */ 1183163953Srrs retval = sctp_process_init(init_cp, stcb, net); 1184163953Srrs if (retval < 0) { 1185166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1186166023Srrs asoc->cookie_how[how_indx] = 3; 1187163953Srrs return (NULL); 1188163953Srrs } 1189163953Srrs /* we have already processed the INIT so no problem */ 1190163953Srrs sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1191165220Srrs net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1192165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1193163953Srrs /* update current state */ 1194166675Srrs if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1195166675Srrs SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1196166675Srrs else 1197166675Srrs SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1198163953Srrs if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1199166675Srrs asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 1200163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1201163953Srrs stcb->sctp_ep, stcb, asoc->primary_destination); 1202163953Srrs 1203166675Srrs } else { 1204163953Srrs /* if ok, move to OPEN state */ 1205163953Srrs asoc->state = SCTP_STATE_OPEN; 1206163953Srrs } 1207166675Srrs SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1208165220Srrs sctp_stop_all_cookie_timers(stcb); 1209163953Srrs if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1210163953Srrs (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1211163953Srrs (inp->sctp_socket->so_qlimit == 0) 1212163953Srrs ) { 1213163953Srrs /* 1214163953Srrs * Here is where collision would go if we 1215163953Srrs * did a connect() and instead got a 1216163953Srrs * init/init-ack/cookie done before the 1217163953Srrs * init-ack came back.. 1218163953Srrs */ 1219163953Srrs stcb->sctp_ep->sctp_flags |= 1220163953Srrs SCTP_PCB_FLAGS_CONNECTED; 1221163953Srrs soisconnected(stcb->sctp_ep->sctp_socket); 1222163953Srrs } 1223163953Srrs /* notify upper layer */ 1224163953Srrs *notification = SCTP_NOTIFY_ASSOC_UP; 1225163953Srrs /* 1226163953Srrs * since we did not send a HB make sure we don't 1227163953Srrs * double things 1228163953Srrs */ 1229163953Srrs net->hb_responded = 1; 1230163953Srrs 1231163953Srrs if (stcb->asoc.sctp_autoclose_ticks && 1232163953Srrs (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1233163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1234163953Srrs inp, stcb, NULL); 1235163953Srrs } 1236163953Srrs break; 1237163953Srrs default: 1238163953Srrs /* 1239163953Srrs * we're in the OPEN state (or beyond), so peer must 1240163953Srrs * have simply lost the COOKIE-ACK 1241163953Srrs */ 1242166675Srrs 1243163953Srrs break; 1244163953Srrs } /* end switch */ 1245165220Srrs sctp_stop_all_cookie_timers(stcb); 1246163953Srrs /* 1247163953Srrs * We ignore the return code here.. not sure if we should 1248163953Srrs * somehow abort.. but we do have an existing asoc. This 1249163953Srrs * really should not fail. 1250163953Srrs */ 1251163953Srrs if (sctp_load_addresses_from_init(stcb, m, iphlen, 1252163953Srrs init_offset + sizeof(struct sctp_init_chunk), 1253163953Srrs initack_offset, sh, init_src)) { 1254166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1255166023Srrs asoc->cookie_how[how_indx] = 4; 1256163953Srrs return (NULL); 1257163953Srrs } 1258163953Srrs /* respond with a COOKIE-ACK */ 1259165220Srrs sctp_toss_old_cookies(stcb, asoc); 1260163953Srrs sctp_send_cookie_ack(stcb); 1261166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1262166023Srrs asoc->cookie_how[how_indx] = 5; 1263163953Srrs return (stcb); 1264163953Srrs } /* end if */ 1265163953Srrs if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1266163953Srrs ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1267163953Srrs cookie->tie_tag_my_vtag == 0 && 1268163953Srrs cookie->tie_tag_peer_vtag == 0) { 1269163953Srrs /* 1270163953Srrs * case C in Section 5.2.4 Table 2: XMOO silently discard 1271163953Srrs */ 1272166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1273166023Srrs asoc->cookie_how[how_indx] = 6; 1274163953Srrs return (NULL); 1275163953Srrs } 1276163953Srrs if (ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag && 1277163953Srrs (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag || 1278163953Srrs init_cp->init.initiate_tag == 0)) { 1279163953Srrs /* 1280163953Srrs * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1281163953Srrs * should be ok, re-accept peer info 1282163953Srrs */ 1283166023Srrs if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1284166023Srrs /* 1285166023Srrs * Extension of case C. If we hit this, then the 1286166023Srrs * random number generator returned the same vtag 1287166023Srrs * when we first sent our INIT-ACK and when we later 1288166023Srrs * sent our INIT. The side with the seq numbers that 1289166023Srrs * are different will be the one that normnally 1290166023Srrs * would have hit case C. This in effect "extends" 1291166023Srrs * our vtags in this collision case to be 64 bits. 1292166023Srrs * The same collision could occur aka you get both 1293166023Srrs * vtag and seq number the same twice in a row.. but 1294166023Srrs * is much less likely. If it did happen then we 1295166023Srrs * would proceed through and bring up the assoc.. we 1296166023Srrs * may end up with the wrong stream setup however.. 1297166023Srrs * which would be bad.. but there is no way to 1298166023Srrs * tell.. until we send on a stream that does not 1299166023Srrs * exist :-) 1300166023Srrs */ 1301166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1302166023Srrs asoc->cookie_how[how_indx] = 7; 1303166023Srrs 1304166023Srrs return (NULL); 1305166023Srrs } 1306166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1307166023Srrs asoc->cookie_how[how_indx] = 8; 1308165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1309163953Srrs sctp_stop_all_cookie_timers(stcb); 1310163953Srrs /* 1311163953Srrs * since we did not send a HB make sure we don't double 1312163953Srrs * things 1313163953Srrs */ 1314163953Srrs net->hb_responded = 1; 1315163953Srrs if (stcb->asoc.sctp_autoclose_ticks && 1316163953Srrs sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1317163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1318163953Srrs NULL); 1319163953Srrs } 1320163953Srrs asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1321164205Srrs asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1322164205Srrs 1323164205Srrs /* Note last_cwr_tsn? where is this used? */ 1324163953Srrs asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1325164205Srrs if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1326164205Srrs /* 1327164205Srrs * Ok the peer probably discarded our data (if we 1328164205Srrs * echoed a cookie+data). So anything on the 1329164205Srrs * sent_queue should be marked for retransmit, we 1330164205Srrs * may not get something to kick us so it COULD 1331164205Srrs * still take a timeout to move these.. but it can't 1332164205Srrs * hurt to mark them. 1333164205Srrs */ 1334164205Srrs struct sctp_tmit_chunk *chk; 1335163953Srrs 1336164205Srrs TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1337164205Srrs if (chk->sent < SCTP_DATAGRAM_RESEND) { 1338164205Srrs chk->sent = SCTP_DATAGRAM_RESEND; 1339168124Srrs sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1340164205Srrs spec_flag++; 1341164205Srrs } 1342164205Srrs } 1343164205Srrs 1344164205Srrs } 1345163953Srrs /* process the INIT info (peer's info) */ 1346163953Srrs retval = sctp_process_init(init_cp, stcb, net); 1347163953Srrs if (retval < 0) { 1348166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1349166023Srrs asoc->cookie_how[how_indx] = 9; 1350163953Srrs return (NULL); 1351163953Srrs } 1352163953Srrs if (sctp_load_addresses_from_init(stcb, m, iphlen, 1353163953Srrs init_offset + sizeof(struct sctp_init_chunk), 1354163953Srrs initack_offset, sh, init_src)) { 1355166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1356166023Srrs asoc->cookie_how[how_indx] = 10; 1357163953Srrs return (NULL); 1358163953Srrs } 1359163953Srrs if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1360163953Srrs (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1361163953Srrs *notification = SCTP_NOTIFY_ASSOC_UP; 1362163953Srrs 1363163953Srrs if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1364163953Srrs (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1365163953Srrs (inp->sctp_socket->so_qlimit == 0)) { 1366163953Srrs stcb->sctp_ep->sctp_flags |= 1367163953Srrs SCTP_PCB_FLAGS_CONNECTED; 1368163953Srrs soisconnected(stcb->sctp_ep->sctp_socket); 1369163953Srrs } 1370166675Srrs if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1371166675Srrs SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1372166675Srrs else 1373166675Srrs SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1374166675Srrs SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1375166675Srrs SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1376166675Srrs } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1377166675Srrs SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1378166675Srrs } else { 1379166675Srrs SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1380163953Srrs } 1381163953Srrs if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1382166675Srrs asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 1383163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1384163953Srrs stcb->sctp_ep, stcb, asoc->primary_destination); 1385163953Srrs 1386163953Srrs } else { 1387163953Srrs asoc->state = SCTP_STATE_OPEN; 1388163953Srrs } 1389163953Srrs sctp_stop_all_cookie_timers(stcb); 1390165220Srrs sctp_toss_old_cookies(stcb, asoc); 1391163953Srrs sctp_send_cookie_ack(stcb); 1392164205Srrs if (spec_flag) { 1393164205Srrs /* 1394164205Srrs * only if we have retrans set do we do this. What 1395164205Srrs * this call does is get only the COOKIE-ACK out and 1396164205Srrs * then when we return the normal call to 1397164205Srrs * sctp_chunk_output will get the retrans out behind 1398164205Srrs * this. 1399164205Srrs */ 1400164205Srrs sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK); 1401164205Srrs } 1402166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1403166023Srrs asoc->cookie_how[how_indx] = 11; 1404166023Srrs 1405163953Srrs return (stcb); 1406163953Srrs } 1407163953Srrs if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1408163953Srrs ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1409163953Srrs cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1410163953Srrs cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1411163953Srrs cookie->tie_tag_peer_vtag != 0) { 1412163953Srrs struct sctpasochead *head; 1413163953Srrs 1414163953Srrs /* 1415163953Srrs * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1416163953Srrs */ 1417165220Srrs /* temp code */ 1418166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1419166023Srrs asoc->cookie_how[how_indx] = 12; 1420165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1421165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1422165647Srrs 1423163953Srrs *sac_assoc_id = sctp_get_associd(stcb); 1424163953Srrs /* notify upper layer */ 1425163953Srrs *notification = SCTP_NOTIFY_ASSOC_RESTART; 1426165220Srrs atomic_add_int(&stcb->asoc.refcnt, 1); 1427166675Srrs if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1428166675Srrs (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1429166675Srrs (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1430166675Srrs SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1431166675Srrs } 1432166675Srrs if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1433166675Srrs SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1434166675Srrs } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1435166675Srrs SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1436166675Srrs } 1437165647Srrs if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1438165647Srrs asoc->state = SCTP_STATE_OPEN | 1439165647Srrs SCTP_STATE_SHUTDOWN_PENDING; 1440165647Srrs sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1441165647Srrs stcb->sctp_ep, stcb, asoc->primary_destination); 1442165647Srrs 1443165647Srrs } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1444165647Srrs /* move to OPEN state, if not in SHUTDOWN_SENT */ 1445165647Srrs asoc->state = SCTP_STATE_OPEN; 1446165647Srrs } 1447165647Srrs asoc->pre_open_streams = 1448165647Srrs ntohs(initack_cp->init.num_outbound_streams); 1449165647Srrs asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1450165647Srrs asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1451165647Srrs 1452165647Srrs asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1453165647Srrs asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1454165647Srrs 1455165647Srrs asoc->str_reset_seq_in = asoc->init_seq_number; 1456165647Srrs 1457165647Srrs asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1458165647Srrs if (asoc->mapping_array) 1459165647Srrs memset(asoc->mapping_array, 0, 1460165647Srrs asoc->mapping_array_size); 1461165220Srrs SCTP_TCB_UNLOCK(stcb); 1462165220Srrs SCTP_INP_INFO_WLOCK(); 1463165220Srrs SCTP_INP_WLOCK(stcb->sctp_ep); 1464165220Srrs SCTP_TCB_LOCK(stcb); 1465165220Srrs atomic_add_int(&stcb->asoc.refcnt, -1); 1466163953Srrs /* send up all the data */ 1467164205Srrs SCTP_TCB_SEND_LOCK(stcb); 1468165220Srrs 1469164205Srrs sctp_report_all_outbound(stcb, 1); 1470165220Srrs for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1471165220Srrs stcb->asoc.strmout[i].stream_no = i; 1472165220Srrs stcb->asoc.strmout[i].next_sequence_sent = 0; 1473165220Srrs stcb->asoc.strmout[i].last_msg_incomplete = 0; 1474165220Srrs } 1475163953Srrs /* process the INIT-ACK info (my info) */ 1476163953Srrs asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1477163953Srrs asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1478163953Srrs 1479163953Srrs /* pull from vtag hash */ 1480163953Srrs LIST_REMOVE(stcb, sctp_asocs); 1481163953Srrs /* re-insert to new vtag position */ 1482163953Srrs head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1483163953Srrs sctppcbinfo.hashasocmark)]; 1484163953Srrs /* 1485163953Srrs * put it in the bucket in the vtag hash of assoc's for the 1486163953Srrs * system 1487163953Srrs */ 1488163953Srrs LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1489163953Srrs 1490163953Srrs /* Is this the first restart? */ 1491163953Srrs if (stcb->asoc.in_restart_hash == 0) { 1492163953Srrs /* Ok add it to assoc_id vtag hash */ 1493163953Srrs head = &sctppcbinfo.sctp_restarthash[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id, 1494163953Srrs sctppcbinfo.hashrestartmark)]; 1495163953Srrs LIST_INSERT_HEAD(head, stcb, sctp_tcbrestarhash); 1496163953Srrs stcb->asoc.in_restart_hash = 1; 1497163953Srrs } 1498163953Srrs /* process the INIT info (peer's info) */ 1499164205Srrs SCTP_TCB_SEND_UNLOCK(stcb); 1500165220Srrs SCTP_INP_WUNLOCK(stcb->sctp_ep); 1501165220Srrs SCTP_INP_INFO_WUNLOCK(); 1502165220Srrs 1503163953Srrs retval = sctp_process_init(init_cp, stcb, net); 1504163953Srrs if (retval < 0) { 1505166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1506166023Srrs asoc->cookie_how[how_indx] = 13; 1507166023Srrs 1508163953Srrs return (NULL); 1509163953Srrs } 1510163953Srrs /* 1511163953Srrs * since we did not send a HB make sure we don't double 1512163953Srrs * things 1513163953Srrs */ 1514163953Srrs net->hb_responded = 1; 1515163953Srrs 1516163953Srrs if (sctp_load_addresses_from_init(stcb, m, iphlen, 1517163953Srrs init_offset + sizeof(struct sctp_init_chunk), 1518163953Srrs initack_offset, sh, init_src)) { 1519166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1520166023Srrs asoc->cookie_how[how_indx] = 14; 1521166023Srrs 1522163953Srrs return (NULL); 1523163953Srrs } 1524163953Srrs /* respond with a COOKIE-ACK */ 1525163953Srrs sctp_stop_all_cookie_timers(stcb); 1526165220Srrs sctp_toss_old_cookies(stcb, asoc); 1527163953Srrs sctp_send_cookie_ack(stcb); 1528166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1529166023Srrs asoc->cookie_how[how_indx] = 15; 1530163953Srrs 1531163953Srrs return (stcb); 1532163953Srrs } 1533166023Srrs if (how_indx < sizeof(asoc->cookie_how)) 1534166023Srrs asoc->cookie_how[how_indx] = 16; 1535163953Srrs /* all other cases... */ 1536163953Srrs return (NULL); 1537163953Srrs} 1538163953Srrs 1539166086Srrs 1540163953Srrs/* 1541163953Srrs * handle a state cookie for a new association m: input packet mbuf chain-- 1542163953Srrs * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1543163953Srrs * and the cookie signature does not exist offset: offset into mbuf to the 1544163953Srrs * cookie-echo chunk length: length of the cookie chunk to: where the init 1545163953Srrs * was from returns a new TCB 1546163953Srrs */ 1547163953Srrsstatic struct sctp_tcb * 1548163953Srrssctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1549163953Srrs struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1550163953Srrs struct sctp_inpcb *inp, struct sctp_nets **netp, 1551163953Srrs struct sockaddr *init_src, int *notification, 1552163953Srrs int auth_skipped, uint32_t auth_offset, uint32_t auth_len) 1553163953Srrs{ 1554163953Srrs struct sctp_tcb *stcb; 1555163953Srrs struct sctp_init_chunk *init_cp, init_buf; 1556163953Srrs struct sctp_init_ack_chunk *initack_cp, initack_buf; 1557163953Srrs struct sockaddr_storage sa_store; 1558163953Srrs struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1559163953Srrs struct sockaddr_in *sin; 1560163953Srrs struct sockaddr_in6 *sin6; 1561163953Srrs struct sctp_association *asoc; 1562168299Srrs uint32_t vrf_id; 1563163953Srrs int chk_length; 1564163953Srrs int init_offset, initack_offset, initack_limit; 1565163953Srrs int retval; 1566163953Srrs int error = 0; 1567163953Srrs uint32_t old_tag; 1568166675Srrs uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1569163953Srrs 1570168299Srrs vrf_id = inp->def_vrf_id; 1571167598Srrs 1572163953Srrs /* 1573163953Srrs * find and validate the INIT chunk in the cookie (peer's info) the 1574163953Srrs * INIT should start after the cookie-echo header struct (chunk 1575163953Srrs * header, state cookie header struct) 1576163953Srrs */ 1577163953Srrs init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1578163953Srrs init_cp = (struct sctp_init_chunk *) 1579163953Srrs sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1580163953Srrs (uint8_t *) & init_buf); 1581163953Srrs if (init_cp == NULL) { 1582163953Srrs /* could not pull a INIT chunk in cookie */ 1583163953Srrs#ifdef SCTP_DEBUG 1584163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1585163953Srrs printf("process_cookie_new: could not pull INIT chunk hdr\n"); 1586163953Srrs } 1587163953Srrs#endif /* SCTP_DEBUG */ 1588163953Srrs return (NULL); 1589163953Srrs } 1590163953Srrs chk_length = ntohs(init_cp->ch.chunk_length); 1591163953Srrs if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1592163953Srrs#ifdef SCTP_DEBUG 1593163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1594163953Srrs printf("HUH? process_cookie_new: could not find INIT chunk!\n"); 1595163953Srrs } 1596163953Srrs#endif /* SCTP_DEBUG */ 1597163953Srrs return (NULL); 1598163953Srrs } 1599163953Srrs initack_offset = init_offset + SCTP_SIZE32(chk_length); 1600163953Srrs /* 1601163953Srrs * find and validate the INIT-ACK chunk in the cookie (my info) the 1602163953Srrs * INIT-ACK follows the INIT chunk 1603163953Srrs */ 1604163953Srrs initack_cp = (struct sctp_init_ack_chunk *) 1605163953Srrs sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1606163953Srrs (uint8_t *) & initack_buf); 1607163953Srrs if (initack_cp == NULL) { 1608163953Srrs /* could not pull INIT-ACK chunk in cookie */ 1609163953Srrs#ifdef SCTP_DEBUG 1610163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1611163953Srrs printf("process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1612163953Srrs } 1613163953Srrs#endif /* SCTP_DEBUG */ 1614163953Srrs return (NULL); 1615163953Srrs } 1616163953Srrs chk_length = ntohs(initack_cp->ch.chunk_length); 1617163953Srrs if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1618163953Srrs return (NULL); 1619163953Srrs } 1620163953Srrs /* 1621163953Srrs * NOTE: We can't use the INIT_ACK's chk_length to determine the 1622163953Srrs * "initack_limit" value. This is because the chk_length field 1623163953Srrs * includes the length of the cookie, but the cookie is omitted when 1624163953Srrs * the INIT and INIT_ACK are tacked onto the cookie... 1625163953Srrs */ 1626163953Srrs initack_limit = offset + cookie_len; 1627163953Srrs 1628163953Srrs /* 1629163953Srrs * now that we know the INIT/INIT-ACK are in place, create a new TCB 1630163953Srrs * and popluate 1631163953Srrs */ 1632163953Srrs stcb = sctp_aloc_assoc(inp, init_src, 0, &error, 1633168299Srrs ntohl(initack_cp->init.initiate_tag), vrf_id); 1634163953Srrs if (stcb == NULL) { 1635163953Srrs struct mbuf *op_err; 1636163953Srrs 1637163953Srrs /* memory problem? */ 1638163953Srrs#ifdef SCTP_DEBUG 1639163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1640163953Srrs printf("process_cookie_new: no room for another TCB!\n"); 1641163953Srrs } 1642163953Srrs#endif /* SCTP_DEBUG */ 1643163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1644163953Srrs sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 1645163953Srrs sh, op_err); 1646163953Srrs return (NULL); 1647163953Srrs } 1648163953Srrs /* get the correct sctp_nets */ 1649163953Srrs *netp = sctp_findnet(stcb, init_src); 1650163953Srrs asoc = &stcb->asoc; 1651163953Srrs /* get scope variables out of cookie */ 1652163953Srrs asoc->ipv4_local_scope = cookie->ipv4_scope; 1653163953Srrs asoc->site_scope = cookie->site_scope; 1654163953Srrs asoc->local_scope = cookie->local_scope; 1655163953Srrs asoc->loopback_scope = cookie->loopback_scope; 1656163953Srrs 1657163953Srrs if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 1658163953Srrs (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 1659163953Srrs struct mbuf *op_err; 1660163953Srrs 1661163953Srrs /* 1662163953Srrs * Houston we have a problem. The EP changed while the 1663163953Srrs * cookie was in flight. Only recourse is to abort the 1664163953Srrs * association. 1665163953Srrs */ 1666163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1667163953Srrs sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 1668163953Srrs sh, op_err); 1669163953Srrs return (NULL); 1670163953Srrs } 1671163953Srrs /* process the INIT-ACK info (my info) */ 1672163953Srrs old_tag = asoc->my_vtag; 1673163953Srrs asoc->assoc_id = asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1674163953Srrs asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1675163953Srrs asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1676163953Srrs asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1677163953Srrs asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1678163953Srrs asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1679163953Srrs asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1680163953Srrs asoc->str_reset_seq_in = asoc->init_seq_number; 1681163953Srrs 1682163953Srrs asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1683163953Srrs 1684163953Srrs /* process the INIT info (peer's info) */ 1685163953Srrs retval = sctp_process_init(init_cp, stcb, *netp); 1686163953Srrs if (retval < 0) { 1687165220Srrs sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1688163953Srrs return (NULL); 1689163953Srrs } 1690163953Srrs /* load all addresses */ 1691163953Srrs if (sctp_load_addresses_from_init(stcb, m, iphlen, 1692163953Srrs init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 1693163953Srrs init_src)) { 1694165220Srrs sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1695163953Srrs return (NULL); 1696163953Srrs } 1697163953Srrs /* 1698163953Srrs * verify any preceding AUTH chunk that was skipped 1699163953Srrs */ 1700163953Srrs /* pull the local authentication parameters from the cookie/init-ack */ 1701163953Srrs sctp_auth_get_cookie_params(stcb, m, 1702163953Srrs initack_offset + sizeof(struct sctp_init_ack_chunk), 1703163953Srrs initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 1704163953Srrs if (auth_skipped) { 1705163953Srrs struct sctp_auth_chunk *auth; 1706163953Srrs 1707163953Srrs auth = (struct sctp_auth_chunk *) 1708166675Srrs sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 1709163953Srrs if (sctp_handle_auth(stcb, auth, m, auth_offset)) { 1710163953Srrs /* auth HMAC failed, dump the assoc and packet */ 1711163953Srrs#ifdef SCTP_DEBUG 1712163953Srrs if (sctp_debug_on & SCTP_DEBUG_AUTH1) 1713163953Srrs printf("COOKIE-ECHO: AUTH failed\n"); 1714163953Srrs#endif /* SCTP_DEBUG */ 1715165220Srrs sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 1716163953Srrs return (NULL); 1717163953Srrs } else { 1718163953Srrs /* remaining chunks checked... good to go */ 1719163953Srrs stcb->asoc.authenticated = 1; 1720163953Srrs } 1721163953Srrs } 1722163953Srrs /* update current state */ 1723163953Srrs#ifdef SCTP_DEBUG 1724163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 1725163953Srrs printf("moving to OPEN state\n"); 1726163953Srrs } 1727163953Srrs#endif 1728163953Srrs if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1729163953Srrs asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 1730163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1731163953Srrs stcb->sctp_ep, stcb, asoc->primary_destination); 1732163953Srrs } else { 1733163953Srrs asoc->state = SCTP_STATE_OPEN; 1734163953Srrs } 1735165220Srrs sctp_stop_all_cookie_timers(stcb); 1736163953Srrs SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 1737163953Srrs SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1738163953Srrs 1739163953Srrs /* 1740163953Srrs * if we're doing ASCONFs, check to see if we have any new local 1741163953Srrs * addresses that need to get added to the peer (eg. addresses 1742163953Srrs * changed while cookie echo in flight). This needs to be done 1743163953Srrs * after we go to the OPEN state to do the correct asconf 1744163953Srrs * processing. else, make sure we have the correct addresses in our 1745163953Srrs * lists 1746163953Srrs */ 1747163953Srrs 1748163953Srrs /* warning, we re-use sin, sin6, sa_store here! */ 1749163953Srrs /* pull in local_address (our "from" address) */ 1750163953Srrs if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 1751163953Srrs /* source addr is IPv4 */ 1752163953Srrs sin = (struct sockaddr_in *)initack_src; 1753163953Srrs memset(sin, 0, sizeof(*sin)); 1754163953Srrs sin->sin_family = AF_INET; 1755163953Srrs sin->sin_len = sizeof(struct sockaddr_in); 1756163953Srrs sin->sin_addr.s_addr = cookie->laddress[0]; 1757163953Srrs } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 1758163953Srrs /* source addr is IPv6 */ 1759163953Srrs sin6 = (struct sockaddr_in6 *)initack_src; 1760163953Srrs memset(sin6, 0, sizeof(*sin6)); 1761163953Srrs sin6->sin6_family = AF_INET6; 1762163953Srrs sin6->sin6_len = sizeof(struct sockaddr_in6); 1763163953Srrs sin6->sin6_scope_id = cookie->scope_id; 1764163953Srrs memcpy(&sin6->sin6_addr, cookie->laddress, 1765163953Srrs sizeof(sin6->sin6_addr)); 1766163953Srrs } else { 1767165220Srrs sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 1768163953Srrs return (NULL); 1769163953Srrs } 1770163953Srrs 1771163953Srrs sctp_check_address_list(stcb, m, 1772163953Srrs initack_offset + sizeof(struct sctp_init_ack_chunk), 1773163953Srrs initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 1774163953Srrs initack_src, cookie->local_scope, cookie->site_scope, 1775163953Srrs cookie->ipv4_scope, cookie->loopback_scope); 1776163953Srrs 1777163953Srrs 1778163953Srrs /* set up to notify upper layer */ 1779163953Srrs *notification = SCTP_NOTIFY_ASSOC_UP; 1780163953Srrs if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1781163953Srrs (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1782163953Srrs (inp->sctp_socket->so_qlimit == 0)) { 1783163953Srrs /* 1784163953Srrs * This is an endpoint that called connect() how it got a 1785163953Srrs * cookie that is NEW is a bit of a mystery. It must be that 1786163953Srrs * the INIT was sent, but before it got there.. a complete 1787163953Srrs * INIT/INIT-ACK/COOKIE arrived. But of course then it 1788163953Srrs * should have went to the other code.. not here.. oh well.. 1789163953Srrs * a bit of protection is worth having.. 1790163953Srrs */ 1791163953Srrs stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1792163953Srrs soisconnected(stcb->sctp_ep->sctp_socket); 1793163953Srrs } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1794163953Srrs (inp->sctp_socket->so_qlimit)) { 1795163953Srrs /* 1796163953Srrs * We don't want to do anything with this one. Since it is 1797163953Srrs * the listening guy. The timer will get started for 1798163953Srrs * accepted connections in the caller. 1799163953Srrs */ 1800163953Srrs ; 1801163953Srrs } 1802163953Srrs /* since we did not send a HB make sure we don't double things */ 1803163953Srrs (*netp)->hb_responded = 1; 1804163953Srrs 1805163953Srrs if (stcb->asoc.sctp_autoclose_ticks && 1806163953Srrs sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1807163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1808163953Srrs } 1809163953Srrs /* respond with a COOKIE-ACK */ 1810165220Srrs /* calculate the RTT */ 1811165220Srrs (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 1812165220Srrs &cookie->time_entered); 1813163953Srrs sctp_send_cookie_ack(stcb); 1814163953Srrs return (stcb); 1815163953Srrs} 1816163953Srrs 1817163953Srrs 1818163953Srrs/* 1819163953Srrs * handles a COOKIE-ECHO message stcb: modified to either a new or left as 1820163953Srrs * existing (non-NULL) TCB 1821163953Srrs */ 1822163953Srrsstatic struct mbuf * 1823163953Srrssctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 1824163953Srrs struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 1825163953Srrs struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 1826165220Srrs int auth_skipped, uint32_t auth_offset, uint32_t auth_len, struct sctp_tcb **locked_tcb) 1827163953Srrs{ 1828163953Srrs struct sctp_state_cookie *cookie; 1829163953Srrs struct sockaddr_in6 sin6; 1830163953Srrs struct sockaddr_in sin; 1831163953Srrs struct sctp_tcb *l_stcb = *stcb; 1832163953Srrs struct sctp_inpcb *l_inp; 1833163953Srrs struct sockaddr *to; 1834163953Srrs sctp_assoc_t sac_restart_id; 1835163953Srrs struct sctp_pcb *ep; 1836163953Srrs struct mbuf *m_sig; 1837163953Srrs uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 1838163953Srrs uint8_t *sig; 1839163953Srrs uint8_t cookie_ok = 0; 1840163953Srrs unsigned int size_of_pkt, sig_offset, cookie_offset; 1841163953Srrs unsigned int cookie_len; 1842163953Srrs struct timeval now; 1843163953Srrs struct timeval time_expires; 1844163953Srrs struct sockaddr_storage dest_store; 1845163953Srrs struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 1846163953Srrs struct ip *iph; 1847163953Srrs int notification = 0; 1848163953Srrs struct sctp_nets *netl; 1849163953Srrs int had_a_existing_tcb = 0; 1850163953Srrs 1851163953Srrs#ifdef SCTP_DEBUG 1852163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 1853163953Srrs printf("sctp_handle_cookie: handling COOKIE-ECHO\n"); 1854163953Srrs } 1855163953Srrs#endif 1856163953Srrs 1857163953Srrs if (inp_p == NULL) { 1858163953Srrs return (NULL); 1859163953Srrs } 1860163953Srrs /* First get the destination address setup too. */ 1861163953Srrs iph = mtod(m, struct ip *); 1862163953Srrs if (iph->ip_v == IPVERSION) { 1863163953Srrs /* its IPv4 */ 1864163953Srrs struct sockaddr_in *sin; 1865163953Srrs 1866163953Srrs sin = (struct sockaddr_in *)(localep_sa); 1867163953Srrs memset(sin, 0, sizeof(*sin)); 1868163953Srrs sin->sin_family = AF_INET; 1869163953Srrs sin->sin_len = sizeof(*sin); 1870163953Srrs sin->sin_port = sh->dest_port; 1871163953Srrs sin->sin_addr.s_addr = iph->ip_dst.s_addr; 1872165647Srrs size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 1873163953Srrs } else if (iph->ip_v == (IPV6_VERSION >> 4)) { 1874163953Srrs /* its IPv6 */ 1875163953Srrs struct ip6_hdr *ip6; 1876163953Srrs struct sockaddr_in6 *sin6; 1877163953Srrs 1878163953Srrs sin6 = (struct sockaddr_in6 *)(localep_sa); 1879163953Srrs memset(sin6, 0, sizeof(*sin6)); 1880163953Srrs sin6->sin6_family = AF_INET6; 1881163953Srrs sin6->sin6_len = sizeof(struct sockaddr_in6); 1882163953Srrs ip6 = mtod(m, struct ip6_hdr *); 1883163953Srrs sin6->sin6_port = sh->dest_port; 1884163953Srrs sin6->sin6_addr = ip6->ip6_dst; 1885166675Srrs size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 1886163953Srrs } else { 1887163953Srrs return (NULL); 1888163953Srrs } 1889163953Srrs 1890163953Srrs cookie = &cp->cookie; 1891163953Srrs cookie_offset = offset + sizeof(struct sctp_chunkhdr); 1892163953Srrs cookie_len = ntohs(cp->ch.chunk_length); 1893163953Srrs 1894163953Srrs if ((cookie->peerport != sh->src_port) && 1895163953Srrs (cookie->myport != sh->dest_port) && 1896163953Srrs (cookie->my_vtag != sh->v_tag)) { 1897163953Srrs /* 1898163953Srrs * invalid ports or bad tag. Note that we always leave the 1899163953Srrs * v_tag in the header in network order and when we stored 1900163953Srrs * it in the my_vtag slot we also left it in network order. 1901163953Srrs * This maintians the match even though it may be in the 1902163953Srrs * opposite byte order of the machine :-> 1903163953Srrs */ 1904163953Srrs return (NULL); 1905163953Srrs } 1906163953Srrs if (cookie_len > size_of_pkt || 1907163953Srrs cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 1908163953Srrs sizeof(struct sctp_init_chunk) + 1909163953Srrs sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 1910163953Srrs /* cookie too long! or too small */ 1911163953Srrs return (NULL); 1912163953Srrs } 1913163953Srrs /* 1914163953Srrs * split off the signature into its own mbuf (since it should not be 1915163953Srrs * calculated in the sctp_hmac_m() call). 1916163953Srrs */ 1917163953Srrs sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 1918163953Srrs if (sig_offset > size_of_pkt) { 1919163953Srrs /* packet not correct size! */ 1920163953Srrs /* XXX this may already be accounted for earlier... */ 1921163953Srrs return (NULL); 1922163953Srrs } 1923163953Srrs m_sig = m_split(m, sig_offset, M_DONTWAIT); 1924163953Srrs if (m_sig == NULL) { 1925163953Srrs /* out of memory or ?? */ 1926163953Srrs return (NULL); 1927163953Srrs } 1928163953Srrs /* 1929163953Srrs * compute the signature/digest for the cookie 1930163953Srrs */ 1931163953Srrs ep = &(*inp_p)->sctp_ep; 1932163953Srrs l_inp = *inp_p; 1933163953Srrs if (l_stcb) { 1934163953Srrs SCTP_TCB_UNLOCK(l_stcb); 1935163953Srrs } 1936163953Srrs SCTP_INP_RLOCK(l_inp); 1937163953Srrs if (l_stcb) { 1938163953Srrs SCTP_TCB_LOCK(l_stcb); 1939163953Srrs } 1940163953Srrs /* which cookie is it? */ 1941163953Srrs if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 1942163953Srrs (ep->current_secret_number != ep->last_secret_number)) { 1943163953Srrs /* it's the old cookie */ 1944163953Srrs sctp_hmac_m(SCTP_HMAC, 1945163953Srrs (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 1946163953Srrs SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1947163953Srrs } else { 1948163953Srrs /* it's the current cookie */ 1949163953Srrs sctp_hmac_m(SCTP_HMAC, 1950163953Srrs (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 1951163953Srrs SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1952163953Srrs } 1953163953Srrs /* get the signature */ 1954163953Srrs SCTP_INP_RUNLOCK(l_inp); 1955163953Srrs sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 1956163953Srrs if (sig == NULL) { 1957163953Srrs /* couldn't find signature */ 1958164085Srrs sctp_m_freem(m_sig); 1959163953Srrs return (NULL); 1960163953Srrs } 1961163953Srrs /* compare the received digest with the computed digest */ 1962163953Srrs if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 1963163953Srrs /* try the old cookie? */ 1964163953Srrs if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 1965163953Srrs (ep->current_secret_number != ep->last_secret_number)) { 1966163953Srrs /* compute digest with old */ 1967163953Srrs sctp_hmac_m(SCTP_HMAC, 1968163953Srrs (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 1969163953Srrs SCTP_SECRET_SIZE, m, cookie_offset, calc_sig); 1970163953Srrs /* compare */ 1971163953Srrs if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 1972163953Srrs cookie_ok = 1; 1973163953Srrs } 1974163953Srrs } else { 1975163953Srrs cookie_ok = 1; 1976163953Srrs } 1977163953Srrs 1978163953Srrs /* 1979163953Srrs * Now before we continue we must reconstruct our mbuf so that 1980163953Srrs * normal processing of any other chunks will work. 1981163953Srrs */ 1982163953Srrs { 1983163953Srrs struct mbuf *m_at; 1984163953Srrs 1985163953Srrs m_at = m; 1986165647Srrs while (SCTP_BUF_NEXT(m_at) != NULL) { 1987165647Srrs m_at = SCTP_BUF_NEXT(m_at); 1988163953Srrs } 1989165647Srrs SCTP_BUF_NEXT(m_at) = m_sig; 1990163953Srrs } 1991163953Srrs 1992163953Srrs if (cookie_ok == 0) { 1993163953Srrs#ifdef SCTP_DEBUG 1994163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 1995163953Srrs printf("handle_cookie_echo: cookie signature validation failed!\n"); 1996163953Srrs printf("offset = %u, cookie_offset = %u, sig_offset = %u\n", 1997163953Srrs (uint32_t) offset, cookie_offset, sig_offset); 1998163953Srrs } 1999163953Srrs#endif 2000163953Srrs return (NULL); 2001163953Srrs } 2002163953Srrs /* 2003163953Srrs * check the cookie timestamps to be sure it's not stale 2004163953Srrs */ 2005163953Srrs SCTP_GETTIME_TIMEVAL(&now); 2006163953Srrs /* Expire time is in Ticks, so we convert to seconds */ 2007163953Srrs time_expires.tv_sec = cookie->time_entered.tv_sec + cookie->cookie_life; 2008163953Srrs time_expires.tv_usec = cookie->time_entered.tv_usec; 2009163953Srrs if (timevalcmp(&now, &time_expires, >)) { 2010163953Srrs /* cookie is stale! */ 2011163953Srrs struct mbuf *op_err; 2012163953Srrs struct sctp_stale_cookie_msg *scm; 2013163953Srrs uint32_t tim; 2014163953Srrs 2015163953Srrs op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2016165647Srrs 0, M_DONTWAIT, 1, MT_DATA); 2017163953Srrs if (op_err == NULL) { 2018163953Srrs /* FOOBAR */ 2019163953Srrs return (NULL); 2020163953Srrs } 2021163953Srrs /* pre-reserve some space */ 2022165647Srrs SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 2023165647Srrs SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 2024165647Srrs SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 2025163953Srrs 2026163953Srrs /* Set the len */ 2027165647Srrs SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2028163953Srrs scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2029163953Srrs scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2030163953Srrs scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2031163953Srrs (sizeof(uint32_t)))); 2032163953Srrs /* seconds to usec */ 2033163953Srrs tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2034163953Srrs /* add in usec */ 2035163953Srrs if (tim == 0) 2036163953Srrs tim = now.tv_usec - cookie->time_entered.tv_usec; 2037163953Srrs scm->time_usec = htonl(tim); 2038163953Srrs sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag); 2039163953Srrs return (NULL); 2040163953Srrs } 2041163953Srrs /* 2042163953Srrs * Now we must see with the lookup address if we have an existing 2043163953Srrs * asoc. This will only happen if we were in the COOKIE-WAIT state 2044163953Srrs * and a INIT collided with us and somewhere the peer sent the 2045163953Srrs * cookie on another address besides the single address our assoc 2046163953Srrs * had for him. In this case we will have one of the tie-tags set at 2047163953Srrs * least AND the address field in the cookie can be used to look it 2048163953Srrs * up. 2049163953Srrs */ 2050163953Srrs to = NULL; 2051163953Srrs if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2052163953Srrs memset(&sin6, 0, sizeof(sin6)); 2053163953Srrs sin6.sin6_family = AF_INET6; 2054163953Srrs sin6.sin6_len = sizeof(sin6); 2055163953Srrs sin6.sin6_port = sh->src_port; 2056163953Srrs sin6.sin6_scope_id = cookie->scope_id; 2057163953Srrs memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2058163953Srrs sizeof(sin6.sin6_addr.s6_addr)); 2059163953Srrs to = (struct sockaddr *)&sin6; 2060163953Srrs } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2061163953Srrs memset(&sin, 0, sizeof(sin)); 2062163953Srrs sin.sin_family = AF_INET; 2063163953Srrs sin.sin_len = sizeof(sin); 2064163953Srrs sin.sin_port = sh->src_port; 2065163953Srrs sin.sin_addr.s_addr = cookie->address[0]; 2066163953Srrs to = (struct sockaddr *)&sin; 2067163953Srrs } 2068163953Srrs if ((*stcb == NULL) && to) { 2069163953Srrs /* Yep, lets check */ 2070163953Srrs *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2071163953Srrs if (*stcb == NULL) { 2072163953Srrs /* 2073163953Srrs * We should have only got back the same inp. If we 2074163953Srrs * got back a different ep we have a problem. The 2075163953Srrs * original findep got back l_inp and now 2076163953Srrs */ 2077163953Srrs if (l_inp != *inp_p) { 2078163953Srrs printf("Bad problem find_ep got a diff inp then special_locate?\n"); 2079163953Srrs } 2080165220Srrs } else { 2081165220Srrs if (*locked_tcb == NULL) { 2082165220Srrs /* 2083165220Srrs * In this case we found the assoc only 2084165220Srrs * after we locked the create lock. This 2085165220Srrs * means we are in a colliding case and we 2086165220Srrs * must make sure that we unlock the tcb if 2087165220Srrs * its one of the cases where we throw away 2088165220Srrs * the incoming packets. 2089165220Srrs */ 2090165220Srrs *locked_tcb = *stcb; 2091165220Srrs 2092165220Srrs /* 2093165220Srrs * We must also increment the inp ref count 2094165220Srrs * since the ref_count flags was set when we 2095165220Srrs * did not find the TCB, now we found it 2096165220Srrs * which reduces the refcount.. we must 2097165220Srrs * raise it back out to balance it all :-) 2098165220Srrs */ 2099165220Srrs SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2100165220Srrs if ((*stcb)->sctp_ep != l_inp) { 2101165220Srrs printf("Huh? ep:%p diff then l_inp:%p?\n", 2102165220Srrs (*stcb)->sctp_ep, l_inp); 2103165220Srrs } 2104165220Srrs } 2105163953Srrs } 2106163953Srrs } 2107163953Srrs cookie_len -= SCTP_SIGNATURE_SIZE; 2108163953Srrs if (*stcb == NULL) { 2109163953Srrs /* this is the "normal" case... get a new TCB */ 2110163953Srrs *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2111163953Srrs cookie_len, *inp_p, netp, to, ¬ification, 2112163953Srrs auth_skipped, auth_offset, auth_len); 2113163953Srrs } else { 2114163953Srrs /* this is abnormal... cookie-echo on existing TCB */ 2115163953Srrs had_a_existing_tcb = 1; 2116163953Srrs *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2117163953Srrs cookie, cookie_len, *inp_p, *stcb, *netp, to, ¬ification, 2118163953Srrs &sac_restart_id); 2119163953Srrs } 2120163953Srrs 2121163953Srrs if (*stcb == NULL) { 2122163953Srrs /* still no TCB... must be bad cookie-echo */ 2123163953Srrs return (NULL); 2124163953Srrs } 2125163953Srrs /* 2126163953Srrs * Ok, we built an association so confirm the address we sent the 2127163953Srrs * INIT-ACK to. 2128163953Srrs */ 2129163953Srrs netl = sctp_findnet(*stcb, to); 2130163953Srrs /* 2131163953Srrs * This code should in theory NOT run but 2132163953Srrs */ 2133163953Srrs if (netl == NULL) { 2134163953Srrs /* TSNH! Huh, why do I need to add this address here? */ 2135163953Srrs int ret; 2136163953Srrs 2137165220Srrs ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2138165220Srrs SCTP_IN_COOKIE_PROC); 2139163953Srrs netl = sctp_findnet(*stcb, to); 2140163953Srrs } 2141163953Srrs if (netl) { 2142163953Srrs if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2143163953Srrs netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2144163953Srrs sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2145163953Srrs netl); 2146163953Srrs sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2147163953Srrs (*stcb), 0, (void *)netl); 2148163953Srrs } 2149163953Srrs } 2150163953Srrs if (*stcb) { 2151163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2152163953Srrs *stcb, NULL); 2153163953Srrs } 2154163953Srrs if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2155163953Srrs if (!had_a_existing_tcb || 2156163953Srrs (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2157163953Srrs /* 2158163953Srrs * If we have a NEW cookie or the connect never 2159163953Srrs * reached the connected state during collision we 2160163953Srrs * must do the TCP accept thing. 2161163953Srrs */ 2162163953Srrs struct socket *so, *oso; 2163163953Srrs struct sctp_inpcb *inp; 2164163953Srrs 2165163953Srrs if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2166163953Srrs /* 2167163953Srrs * For a restart we will keep the same 2168163953Srrs * socket, no need to do anything. I THINK!! 2169163953Srrs */ 2170163953Srrs sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id); 2171163953Srrs return (m); 2172163953Srrs } 2173163953Srrs oso = (*inp_p)->sctp_socket; 2174163953Srrs /* 2175163953Srrs * We do this to keep the sockets side happy durin 2176163953Srrs * the sonewcon ONLY. 2177163953Srrs */ 2178163953Srrs NET_LOCK_GIANT(); 2179163953Srrs SCTP_TCB_UNLOCK((*stcb)); 2180166086Srrs so = sonewconn(oso, 0 2181163953Srrs ); 2182163953Srrs NET_UNLOCK_GIANT(); 2183163953Srrs SCTP_INP_WLOCK((*stcb)->sctp_ep); 2184163953Srrs SCTP_TCB_LOCK((*stcb)); 2185163953Srrs SCTP_INP_WUNLOCK((*stcb)->sctp_ep); 2186163953Srrs if (so == NULL) { 2187163953Srrs struct mbuf *op_err; 2188163953Srrs 2189163953Srrs /* Too many sockets */ 2190163953Srrs#ifdef SCTP_DEBUG 2191163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 2192163953Srrs printf("process_cookie_new: no room for another socket!\n"); 2193163953Srrs } 2194163953Srrs#endif /* SCTP_DEBUG */ 2195163953Srrs op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2196163953Srrs sctp_abort_association(*inp_p, NULL, m, iphlen, 2197163953Srrs sh, op_err); 2198165220Srrs sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2199163953Srrs return (NULL); 2200163953Srrs } 2201163953Srrs inp = (struct sctp_inpcb *)so->so_pcb; 2202166086Srrs SCTP_INP_INCR_REF(inp); 2203166086Srrs /* 2204166086Srrs * We add the unbound flag here so that if we get an 2205166086Srrs * soabort() before we get the move_pcb done, we 2206166086Srrs * will properly cleanup. 2207166086Srrs */ 2208163953Srrs inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2209163953Srrs SCTP_PCB_FLAGS_CONNECTED | 2210163953Srrs SCTP_PCB_FLAGS_IN_TCPPOOL | 2211166086Srrs SCTP_PCB_FLAGS_UNBOUND | 2212163953Srrs (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2213163953Srrs SCTP_PCB_FLAGS_DONT_WAKE); 2214163953Srrs inp->sctp_features = (*inp_p)->sctp_features; 2215163953Srrs inp->sctp_socket = so; 2216163953Srrs inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2217163953Srrs inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2218163953Srrs inp->sctp_context = (*inp_p)->sctp_context; 2219163953Srrs inp->inp_starting_point_for_iterator = NULL; 2220163953Srrs /* 2221163953Srrs * copy in the authentication parameters from the 2222163953Srrs * original endpoint 2223163953Srrs */ 2224163953Srrs if (inp->sctp_ep.local_hmacs) 2225163953Srrs sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2226163953Srrs inp->sctp_ep.local_hmacs = 2227163953Srrs sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2228163953Srrs if (inp->sctp_ep.local_auth_chunks) 2229163953Srrs sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2230163953Srrs inp->sctp_ep.local_auth_chunks = 2231163953Srrs sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2232163953Srrs (void)sctp_copy_skeylist(&(*inp_p)->sctp_ep.shared_keys, 2233163953Srrs &inp->sctp_ep.shared_keys); 2234163953Srrs 2235163953Srrs /* 2236163953Srrs * Now we must move it from one hash table to 2237163953Srrs * another and get the tcb in the right place. 2238163953Srrs */ 2239163953Srrs sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2240163953Srrs sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb); 2241163953Srrs 2242166086Srrs /* 2243166086Srrs * now we must check to see if we were aborted while 2244166086Srrs * the move was going on and the lock/unlock 2245166086Srrs * happened. 2246166086Srrs */ 2247166086Srrs if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2248166086Srrs /* 2249166086Srrs * yep it was, we leave the assoc attached 2250166086Srrs * to the socket since the sctp_inpcb_free() 2251166086Srrs * call will send an abort for us. 2252166086Srrs */ 2253166086Srrs SCTP_INP_DECR_REF(inp); 2254166086Srrs return (NULL); 2255166086Srrs } 2256166086Srrs SCTP_INP_DECR_REF(inp); 2257163953Srrs /* Switch over to the new guy */ 2258163953Srrs *inp_p = inp; 2259166086Srrs sctp_ulp_notify(notification, *stcb, 0, NULL); 2260163953Srrs 2261166086Srrs /* 2262166086Srrs * Pull it from the incomplete queue and wake the 2263166086Srrs * guy 2264166086Srrs */ 2265166086Srrs soisconnected(so); 2266163953Srrs return (m); 2267163953Srrs } 2268163953Srrs } 2269163953Srrs if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2270163953Srrs sctp_ulp_notify(notification, *stcb, 0, NULL); 2271163953Srrs } 2272163953Srrs return (m); 2273163953Srrs} 2274163953Srrs 2275163953Srrsstatic void 2276163953Srrssctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2277163953Srrs struct sctp_tcb *stcb, struct sctp_nets *net) 2278163953Srrs{ 2279163953Srrs /* cp must not be used, others call this without a c-ack :-) */ 2280163953Srrs struct sctp_association *asoc; 2281163953Srrs 2282163953Srrs#ifdef SCTP_DEBUG 2283163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2284163953Srrs printf("sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2285163953Srrs } 2286163953Srrs#endif 2287163953Srrs if (stcb == NULL) 2288163953Srrs return; 2289163953Srrs 2290163953Srrs asoc = &stcb->asoc; 2291163953Srrs 2292163953Srrs sctp_stop_all_cookie_timers(stcb); 2293163953Srrs /* process according to association state */ 2294163953Srrs if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2295163953Srrs /* state change only needed when I am in right state */ 2296163953Srrs#ifdef SCTP_DEBUG 2297163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2298163953Srrs printf("moving to OPEN state\n"); 2299163953Srrs } 2300163953Srrs#endif 2301163953Srrs if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2302163953Srrs asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 2303163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2304163953Srrs stcb->sctp_ep, stcb, asoc->primary_destination); 2305163953Srrs 2306163953Srrs } else { 2307163953Srrs asoc->state = SCTP_STATE_OPEN; 2308163953Srrs } 2309163953Srrs /* update RTO */ 2310163953Srrs SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2311163953Srrs SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2312163953Srrs if (asoc->overall_error_count == 0) { 2313163953Srrs net->RTO = sctp_calculate_rto(stcb, asoc, net, 2314163953Srrs &asoc->time_entered); 2315163953Srrs } 2316163953Srrs SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2317163953Srrs sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL); 2318163953Srrs if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2319163953Srrs (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2320163953Srrs stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2321163953Srrs soisconnected(stcb->sctp_ep->sctp_socket); 2322163953Srrs } 2323163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2324163953Srrs stcb, net); 2325163953Srrs /* 2326163953Srrs * since we did not send a HB make sure we don't double 2327163953Srrs * things 2328163953Srrs */ 2329163953Srrs net->hb_responded = 1; 2330163953Srrs 2331163953Srrs if (stcb->asoc.sctp_autoclose_ticks && 2332163953Srrs sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2333163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2334163953Srrs stcb->sctp_ep, stcb, NULL); 2335163953Srrs } 2336163953Srrs /* 2337163953Srrs * set ASCONF timer if ASCONFs are pending and allowed (eg. 2338163953Srrs * addresses changed when init/cookie echo in flight) 2339163953Srrs */ 2340163953Srrs if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2341163953Srrs (stcb->asoc.peer_supports_asconf) && 2342163953Srrs (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2343163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2344163953Srrs stcb->sctp_ep, stcb, 2345163953Srrs stcb->asoc.primary_destination); 2346163953Srrs } 2347163953Srrs } 2348163953Srrs /* Toss the cookie if I can */ 2349163953Srrs sctp_toss_old_cookies(stcb, asoc); 2350163953Srrs if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2351163953Srrs /* Restart the timer if we have pending data */ 2352163953Srrs struct sctp_tmit_chunk *chk; 2353163953Srrs 2354163953Srrs chk = TAILQ_FIRST(&asoc->sent_queue); 2355163953Srrs if (chk) { 2356163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2357163953Srrs stcb, chk->whoTo); 2358163953Srrs } 2359163953Srrs } 2360163953Srrs} 2361163953Srrs 2362163953Srrsstatic void 2363163953Srrssctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2364163953Srrs struct sctp_tcb *stcb) 2365163953Srrs{ 2366163953Srrs struct sctp_nets *net; 2367163953Srrs struct sctp_tmit_chunk *lchk; 2368163953Srrs uint32_t tsn; 2369163953Srrs 2370163953Srrs if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2371163953Srrs return; 2372163953Srrs } 2373163953Srrs SCTP_STAT_INCR(sctps_recvecne); 2374163953Srrs tsn = ntohl(cp->tsn); 2375163953Srrs /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2376163953Srrs /* Also we make sure we disable the nonce_wait */ 2377163953Srrs lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2378163953Srrs if (lchk == NULL) { 2379163953Srrs stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2380163953Srrs } else { 2381163953Srrs stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2382163953Srrs } 2383163953Srrs stcb->asoc.nonce_wait_for_ecne = 0; 2384163953Srrs stcb->asoc.nonce_sum_check = 0; 2385163953Srrs 2386163953Srrs /* Find where it was sent, if possible */ 2387163953Srrs net = NULL; 2388163953Srrs lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2389163953Srrs while (lchk) { 2390163953Srrs if (lchk->rec.data.TSN_seq == tsn) { 2391163953Srrs net = lchk->whoTo; 2392163953Srrs break; 2393163953Srrs } 2394163953Srrs if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2395163953Srrs break; 2396163953Srrs lchk = TAILQ_NEXT(lchk, sctp_next); 2397163953Srrs } 2398163953Srrs if (net == NULL) 2399163953Srrs /* default is we use the primary */ 2400163953Srrs net = stcb->asoc.primary_destination; 2401163953Srrs 2402163953Srrs if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2403163953Srrs#ifdef SCTP_CWND_MONITOR 2404163953Srrs int old_cwnd; 2405163953Srrs 2406163953Srrs old_cwnd = net->cwnd; 2407163953Srrs#endif 2408163953Srrs SCTP_STAT_INCR(sctps_ecnereducedcwnd); 2409163953Srrs net->ssthresh = net->cwnd / 2; 2410163953Srrs if (net->ssthresh < net->mtu) { 2411163953Srrs net->ssthresh = net->mtu; 2412163953Srrs /* here back off the timer as well, to slow us down */ 2413163953Srrs net->RTO <<= 2; 2414163953Srrs } 2415163953Srrs net->cwnd = net->ssthresh; 2416163953Srrs#ifdef SCTP_CWND_MONITOR 2417163953Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), SCTP_CWND_LOG_FROM_SAT); 2418163953Srrs#endif 2419163953Srrs /* 2420163953Srrs * we reduce once every RTT. So we will only lower cwnd at 2421163953Srrs * the next sending seq i.e. the resync_tsn. 2422163953Srrs */ 2423163953Srrs stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2424163953Srrs } 2425163953Srrs /* 2426163953Srrs * We always send a CWR this way if our previous one was lost our 2427163953Srrs * peer will get an update, or if it is not time again to reduce we 2428163953Srrs * still get the cwr to the peer. 2429163953Srrs */ 2430163953Srrs sctp_send_cwr(stcb, net, tsn); 2431163953Srrs} 2432163953Srrs 2433163953Srrsstatic void 2434163953Srrssctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2435163953Srrs{ 2436163953Srrs /* 2437163953Srrs * Here we get a CWR from the peer. We must look in the outqueue and 2438163953Srrs * make sure that we have a covered ECNE in teh control chunk part. 2439163953Srrs * If so remove it. 2440163953Srrs */ 2441163953Srrs struct sctp_tmit_chunk *chk; 2442163953Srrs struct sctp_ecne_chunk *ecne; 2443163953Srrs 2444163953Srrs TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2445163953Srrs if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2446163953Srrs continue; 2447163953Srrs } 2448163953Srrs /* 2449163953Srrs * Look for and remove if it is the right TSN. Since there 2450163953Srrs * is only ONE ECNE on the control queue at any one time we 2451163953Srrs * don't need to worry about more than one! 2452163953Srrs */ 2453163953Srrs ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2454163953Srrs if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2455163953Srrs MAX_TSN) || (cp->tsn == ecne->tsn)) { 2456163953Srrs /* this covers this ECNE, we can remove it */ 2457163953Srrs stcb->asoc.ecn_echo_cnt_onq--; 2458163953Srrs TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2459163953Srrs sctp_next); 2460163953Srrs if (chk->data) { 2461163953Srrs sctp_m_freem(chk->data); 2462163953Srrs chk->data = NULL; 2463163953Srrs } 2464163953Srrs stcb->asoc.ctrl_queue_cnt--; 2465163953Srrs sctp_free_remote_addr(chk->whoTo); 2466163953Srrs sctp_free_a_chunk(stcb, chk); 2467163953Srrs break; 2468163953Srrs } 2469163953Srrs } 2470163953Srrs} 2471163953Srrs 2472163953Srrsstatic void 2473163953Srrssctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 2474163953Srrs struct sctp_tcb *stcb, struct sctp_nets *net) 2475163953Srrs{ 2476163953Srrs struct sctp_association *asoc; 2477163953Srrs 2478163953Srrs#ifdef SCTP_DEBUG 2479163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 2480163953Srrs printf("sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2481163953Srrs } 2482163953Srrs#endif 2483163953Srrs if (stcb == NULL) 2484163953Srrs return; 2485163953Srrs 2486163953Srrs asoc = &stcb->asoc; 2487163953Srrs /* process according to association state */ 2488163953Srrs if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2489163953Srrs /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 2490163953Srrs SCTP_TCB_UNLOCK(stcb); 2491163953Srrs return; 2492163953Srrs } 2493163953Srrs /* notify upper layer protocol */ 2494163953Srrs if (stcb->sctp_socket) { 2495163953Srrs sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 2496163953Srrs /* are the queues empty? they should be */ 2497163953Srrs if (!TAILQ_EMPTY(&asoc->send_queue) || 2498163953Srrs !TAILQ_EMPTY(&asoc->sent_queue) || 2499163953Srrs !TAILQ_EMPTY(&asoc->out_wheel)) { 2500164205Srrs sctp_report_all_outbound(stcb, 0); 2501163953Srrs } 2502163953Srrs } 2503163953Srrs /* stop the timer */ 2504165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2505163953Srrs SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 2506163953Srrs /* free the TCB */ 2507165220Srrs sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2508163953Srrs return; 2509163953Srrs} 2510163953Srrs 2511163953Srrsstatic int 2512163953Srrsprocess_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 2513163953Srrs struct sctp_nets *net, uint8_t flg) 2514163953Srrs{ 2515163953Srrs switch (desc->chunk_type) { 2516163953Srrs case SCTP_DATA: 2517163953Srrs /* find the tsn to resend (possibly */ 2518163953Srrs { 2519163953Srrs uint32_t tsn; 2520163953Srrs struct sctp_tmit_chunk *tp1; 2521163953Srrs 2522163953Srrs tsn = ntohl(desc->tsn_ifany); 2523163953Srrs tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2524163953Srrs while (tp1) { 2525163953Srrs if (tp1->rec.data.TSN_seq == tsn) { 2526163953Srrs /* found it */ 2527163953Srrs break; 2528163953Srrs } 2529163953Srrs if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 2530163953Srrs MAX_TSN)) { 2531163953Srrs /* not found */ 2532163953Srrs tp1 = NULL; 2533163953Srrs break; 2534163953Srrs } 2535163953Srrs tp1 = TAILQ_NEXT(tp1, sctp_next); 2536163953Srrs } 2537163953Srrs if (tp1 == NULL) { 2538163953Srrs /* 2539163953Srrs * Do it the other way , aka without paying 2540163953Srrs * attention to queue seq order. 2541163953Srrs */ 2542163953Srrs SCTP_STAT_INCR(sctps_pdrpdnfnd); 2543163953Srrs tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2544163953Srrs while (tp1) { 2545163953Srrs if (tp1->rec.data.TSN_seq == tsn) { 2546163953Srrs /* found it */ 2547163953Srrs break; 2548163953Srrs } 2549163953Srrs tp1 = TAILQ_NEXT(tp1, sctp_next); 2550163953Srrs } 2551163953Srrs } 2552163953Srrs if (tp1 == NULL) { 2553163953Srrs SCTP_STAT_INCR(sctps_pdrptsnnf); 2554163953Srrs } 2555163953Srrs if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 2556163953Srrs uint8_t *ddp; 2557163953Srrs 2558163953Srrs if ((stcb->asoc.peers_rwnd == 0) && 2559163953Srrs ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 2560163953Srrs SCTP_STAT_INCR(sctps_pdrpdiwnp); 2561163953Srrs return (0); 2562163953Srrs } 2563163953Srrs if (stcb->asoc.peers_rwnd == 0 && 2564163953Srrs (flg & SCTP_FROM_MIDDLE_BOX)) { 2565163953Srrs SCTP_STAT_INCR(sctps_pdrpdizrw); 2566163953Srrs return (0); 2567163953Srrs } 2568163953Srrs ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 2569163953Srrs sizeof(struct sctp_data_chunk)); 2570163953Srrs { 2571163953Srrs unsigned int iii; 2572163953Srrs 2573163953Srrs for (iii = 0; iii < sizeof(desc->data_bytes); 2574163953Srrs iii++) { 2575163953Srrs if (ddp[iii] != desc->data_bytes[iii]) { 2576163953Srrs SCTP_STAT_INCR(sctps_pdrpbadd); 2577163953Srrs return (-1); 2578163953Srrs } 2579163953Srrs } 2580163953Srrs } 2581163953Srrs /* 2582163953Srrs * We zero out the nonce so resync not 2583163953Srrs * needed 2584163953Srrs */ 2585163953Srrs tp1->rec.data.ect_nonce = 0; 2586163953Srrs 2587163953Srrs if (tp1->do_rtt) { 2588163953Srrs /* 2589163953Srrs * this guy had a RTO calculation 2590163953Srrs * pending on it, cancel it 2591163953Srrs */ 2592163953Srrs tp1->do_rtt = 0; 2593163953Srrs } 2594163953Srrs SCTP_STAT_INCR(sctps_pdrpmark); 2595163953Srrs if (tp1->sent != SCTP_DATAGRAM_RESEND) 2596163953Srrs sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2597163953Srrs tp1->sent = SCTP_DATAGRAM_RESEND; 2598163953Srrs /* 2599163953Srrs * mark it as if we were doing a FR, since 2600163953Srrs * we will be getting gap ack reports behind 2601163953Srrs * the info from the router. 2602163953Srrs */ 2603163953Srrs tp1->rec.data.doing_fast_retransmit = 1; 2604163953Srrs /* 2605163953Srrs * mark the tsn with what sequences can 2606163953Srrs * cause a new FR. 2607163953Srrs */ 2608163953Srrs if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 2609163953Srrs tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 2610163953Srrs } else { 2611163953Srrs tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 2612163953Srrs } 2613163953Srrs 2614163953Srrs /* restart the timer */ 2615163953Srrs sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2616165220Srrs stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2617163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2618163953Srrs stcb, tp1->whoTo); 2619163953Srrs 2620163953Srrs /* fix counts and things */ 2621165220Srrs#ifdef SCTP_FLIGHT_LOGGING 2622168709Srrs sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 2623165220Srrs tp1->whoTo->flight_size, 2624165220Srrs tp1->book_size, 2625165220Srrs (uintptr_t) stcb, 2626165220Srrs tp1->rec.data.TSN_seq); 2627165220Srrs#endif 2628168709Srrs sctp_flight_size_decrease(tp1); 2629168709Srrs sctp_total_flight_decrease(stcb, tp1); 2630163953Srrs } { 2631163953Srrs /* audit code */ 2632163953Srrs unsigned int audit; 2633163953Srrs 2634163953Srrs audit = 0; 2635163953Srrs TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 2636163953Srrs if (tp1->sent == SCTP_DATAGRAM_RESEND) 2637163953Srrs audit++; 2638163953Srrs } 2639163953Srrs TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 2640163953Srrs sctp_next) { 2641163953Srrs if (tp1->sent == SCTP_DATAGRAM_RESEND) 2642163953Srrs audit++; 2643163953Srrs } 2644163953Srrs if (audit != stcb->asoc.sent_queue_retran_cnt) { 2645163953Srrs printf("**Local Audit finds cnt:%d asoc cnt:%d\n", 2646163953Srrs audit, stcb->asoc.sent_queue_retran_cnt); 2647163953Srrs#ifndef SCTP_AUDITING_ENABLED 2648163953Srrs stcb->asoc.sent_queue_retran_cnt = audit; 2649163953Srrs#endif 2650163953Srrs } 2651163953Srrs } 2652163953Srrs } 2653163953Srrs break; 2654163953Srrs case SCTP_ASCONF: 2655163953Srrs { 2656163953Srrs struct sctp_tmit_chunk *asconf; 2657163953Srrs 2658163953Srrs TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 2659163953Srrs sctp_next) { 2660163953Srrs if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 2661163953Srrs break; 2662163953Srrs } 2663163953Srrs } 2664163953Srrs if (asconf) { 2665163953Srrs if (asconf->sent != SCTP_DATAGRAM_RESEND) 2666163953Srrs sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2667163953Srrs asconf->sent = SCTP_DATAGRAM_RESEND; 2668163953Srrs asconf->snd_count--; 2669163953Srrs } 2670163953Srrs } 2671163953Srrs break; 2672163953Srrs case SCTP_INITIATION: 2673163953Srrs /* resend the INIT */ 2674163953Srrs stcb->asoc.dropped_special_cnt++; 2675163953Srrs if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 2676163953Srrs /* 2677163953Srrs * If we can get it in, in a few attempts we do 2678163953Srrs * this, otherwise we let the timer fire. 2679163953Srrs */ 2680163953Srrs sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 2681165220Srrs stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 2682163953Srrs sctp_send_initiate(stcb->sctp_ep, stcb); 2683163953Srrs } 2684163953Srrs break; 2685163953Srrs case SCTP_SELECTIVE_ACK: 2686163953Srrs /* resend the sack */ 2687163953Srrs sctp_send_sack(stcb); 2688163953Srrs break; 2689163953Srrs case SCTP_HEARTBEAT_REQUEST: 2690163953Srrs /* resend a demand HB */ 2691163953Srrs sctp_send_hb(stcb, 1, net); 2692163953Srrs break; 2693163953Srrs case SCTP_SHUTDOWN: 2694163953Srrs sctp_send_shutdown(stcb, net); 2695163953Srrs break; 2696163953Srrs case SCTP_SHUTDOWN_ACK: 2697163953Srrs sctp_send_shutdown_ack(stcb, net); 2698163953Srrs break; 2699163953Srrs case SCTP_COOKIE_ECHO: 2700163953Srrs { 2701163953Srrs struct sctp_tmit_chunk *cookie; 2702163953Srrs 2703163953Srrs cookie = NULL; 2704163953Srrs TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 2705163953Srrs sctp_next) { 2706163953Srrs if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 2707163953Srrs break; 2708163953Srrs } 2709163953Srrs } 2710163953Srrs if (cookie) { 2711163953Srrs if (cookie->sent != SCTP_DATAGRAM_RESEND) 2712163953Srrs sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2713163953Srrs cookie->sent = SCTP_DATAGRAM_RESEND; 2714163953Srrs sctp_stop_all_cookie_timers(stcb); 2715163953Srrs } 2716163953Srrs } 2717163953Srrs break; 2718163953Srrs case SCTP_COOKIE_ACK: 2719163953Srrs sctp_send_cookie_ack(stcb); 2720163953Srrs break; 2721163953Srrs case SCTP_ASCONF_ACK: 2722163953Srrs /* resend last asconf ack */ 2723163953Srrs sctp_send_asconf_ack(stcb, 1); 2724163953Srrs break; 2725163953Srrs case SCTP_FORWARD_CUM_TSN: 2726163953Srrs send_forward_tsn(stcb, &stcb->asoc); 2727163953Srrs break; 2728163953Srrs /* can't do anything with these */ 2729163953Srrs case SCTP_PACKET_DROPPED: 2730163953Srrs case SCTP_INITIATION_ACK: /* this should not happen */ 2731163953Srrs case SCTP_HEARTBEAT_ACK: 2732163953Srrs case SCTP_ABORT_ASSOCIATION: 2733163953Srrs case SCTP_OPERATION_ERROR: 2734163953Srrs case SCTP_SHUTDOWN_COMPLETE: 2735163953Srrs case SCTP_ECN_ECHO: 2736163953Srrs case SCTP_ECN_CWR: 2737163953Srrs default: 2738163953Srrs break; 2739163953Srrs } 2740163953Srrs return (0); 2741163953Srrs} 2742163953Srrs 2743163953Srrsvoid 2744163953Srrssctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2745163953Srrs{ 2746163953Srrs int i; 2747163953Srrs uint16_t temp; 2748163953Srrs 2749163953Srrs /* 2750163953Srrs * We set things to 0xffff since this is the last delivered sequence 2751163953Srrs * and we will be sending in 0 after the reset. 2752163953Srrs */ 2753163953Srrs 2754163953Srrs if (number_entries) { 2755163953Srrs for (i = 0; i < number_entries; i++) { 2756163953Srrs temp = ntohs(list[i]); 2757163953Srrs if (temp >= stcb->asoc.streamincnt) { 2758163953Srrs continue; 2759163953Srrs } 2760163953Srrs stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 2761163953Srrs } 2762163953Srrs } else { 2763163953Srrs list = NULL; 2764163953Srrs for (i = 0; i < stcb->asoc.streamincnt; i++) { 2765163953Srrs stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 2766163953Srrs } 2767163953Srrs } 2768163953Srrs sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list); 2769163953Srrs} 2770163953Srrs 2771163953Srrsstatic void 2772163953Srrssctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2773163953Srrs{ 2774163953Srrs int i; 2775163953Srrs 2776163953Srrs if (number_entries == 0) { 2777163953Srrs for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 2778163953Srrs stcb->asoc.strmout[i].next_sequence_sent = 0; 2779163953Srrs } 2780163953Srrs } else if (number_entries) { 2781163953Srrs for (i = 0; i < number_entries; i++) { 2782163953Srrs uint16_t temp; 2783163953Srrs 2784163953Srrs temp = ntohs(list[i]); 2785163953Srrs if (temp >= stcb->asoc.streamoutcnt) { 2786163953Srrs /* no such stream */ 2787163953Srrs continue; 2788163953Srrs } 2789163953Srrs stcb->asoc.strmout[temp].next_sequence_sent = 0; 2790163953Srrs } 2791163953Srrs } 2792163953Srrs sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list); 2793163953Srrs} 2794163953Srrs 2795163953Srrs 2796163953Srrsstruct sctp_stream_reset_out_request * 2797163953Srrssctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 2798163953Srrs{ 2799163953Srrs struct sctp_association *asoc; 2800163953Srrs struct sctp_stream_reset_out_req *req; 2801163953Srrs struct sctp_stream_reset_out_request *r; 2802163953Srrs struct sctp_tmit_chunk *chk; 2803163953Srrs int len, clen; 2804163953Srrs 2805163953Srrs asoc = &stcb->asoc; 2806163953Srrs if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 2807163953Srrs return (NULL); 2808163953Srrs } 2809163953Srrs if (stcb->asoc.str_reset == NULL) { 2810163953Srrs return (NULL); 2811163953Srrs } 2812163953Srrs chk = stcb->asoc.str_reset; 2813163953Srrs if (chk->data == NULL) { 2814163953Srrs return (NULL); 2815163953Srrs } 2816163953Srrs if (bchk) { 2817163953Srrs /* he wants a copy of the chk pointer */ 2818163953Srrs *bchk = chk; 2819163953Srrs } 2820163953Srrs clen = chk->send_size; 2821163953Srrs req = mtod(chk->data, struct sctp_stream_reset_out_req *); 2822163953Srrs r = &req->sr_req; 2823163953Srrs if (ntohl(r->request_seq) == seq) { 2824163953Srrs /* found it */ 2825163953Srrs return (r); 2826163953Srrs } 2827163953Srrs len = SCTP_SIZE32(ntohs(r->ph.param_length)); 2828163953Srrs if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 2829163953Srrs /* move to the next one, there can only be a max of two */ 2830163953Srrs r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 2831163953Srrs if (ntohl(r->request_seq) == seq) { 2832163953Srrs return (r); 2833163953Srrs } 2834163953Srrs } 2835163953Srrs /* that seq is not here */ 2836163953Srrs return (NULL); 2837163953Srrs} 2838163953Srrs 2839163953Srrsstatic void 2840163953Srrssctp_clean_up_stream_reset(struct sctp_tcb *stcb) 2841163953Srrs{ 2842163953Srrs struct sctp_association *asoc; 2843163953Srrs struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 2844163953Srrs 2845163953Srrs if (stcb->asoc.str_reset == NULL) { 2846163953Srrs return; 2847163953Srrs } 2848166675Srrs asoc = &stcb->asoc; 2849166675Srrs 2850165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 2851163953Srrs TAILQ_REMOVE(&asoc->control_send_queue, 2852163953Srrs chk, 2853163953Srrs sctp_next); 2854163953Srrs if (chk->data) { 2855163953Srrs sctp_m_freem(chk->data); 2856163953Srrs chk->data = NULL; 2857163953Srrs } 2858163953Srrs asoc->ctrl_queue_cnt--; 2859163953Srrs sctp_free_remote_addr(chk->whoTo); 2860163953Srrs 2861163953Srrs sctp_free_a_chunk(stcb, chk); 2862163953Srrs stcb->asoc.str_reset = NULL; 2863163953Srrs} 2864163953Srrs 2865163953Srrs 2866163953Srrsstatic int 2867163953Srrssctp_handle_stream_reset_response(struct sctp_tcb *stcb, 2868163953Srrs uint32_t seq, uint32_t action, 2869164139Srrs struct sctp_stream_reset_response *respin) 2870163953Srrs{ 2871163953Srrs uint16_t type; 2872163953Srrs int lparm_len; 2873163953Srrs struct sctp_association *asoc = &stcb->asoc; 2874163953Srrs struct sctp_tmit_chunk *chk; 2875163953Srrs struct sctp_stream_reset_out_request *srparam; 2876163953Srrs int number_entries; 2877163953Srrs 2878163953Srrs if (asoc->stream_reset_outstanding == 0) { 2879163953Srrs /* duplicate */ 2880163953Srrs return (0); 2881163953Srrs } 2882163953Srrs if (seq == stcb->asoc.str_reset_seq_out) { 2883163953Srrs srparam = sctp_find_stream_reset(stcb, seq, &chk); 2884163953Srrs if (srparam) { 2885163953Srrs stcb->asoc.str_reset_seq_out++; 2886163953Srrs type = ntohs(srparam->ph.param_type); 2887163953Srrs lparm_len = ntohs(srparam->ph.param_length); 2888163953Srrs if (type == SCTP_STR_RESET_OUT_REQUEST) { 2889164139Srrs number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 2890163953Srrs asoc->stream_reset_out_is_outstanding = 0; 2891163953Srrs if (asoc->stream_reset_outstanding) 2892163953Srrs asoc->stream_reset_outstanding--; 2893163953Srrs if (action == SCTP_STREAM_RESET_PERFORMED) { 2894163953Srrs /* do it */ 2895163953Srrs sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 2896163953Srrs } else { 2897163953Srrs sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams); 2898163953Srrs } 2899163953Srrs } else if (type == SCTP_STR_RESET_IN_REQUEST) { 2900163953Srrs /* Answered my request */ 2901164139Srrs number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 2902163953Srrs if (asoc->stream_reset_outstanding) 2903163953Srrs asoc->stream_reset_outstanding--; 2904163953Srrs if (action != SCTP_STREAM_RESET_PERFORMED) { 2905163953Srrs sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams); 2906163953Srrs } 2907163953Srrs } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 2908163953Srrs /** 2909163953Srrs * a) Adopt the new in tsn. 2910163953Srrs * b) reset the map 2911163953Srrs * c) Adopt the new out-tsn 2912163953Srrs */ 2913163953Srrs struct sctp_stream_reset_response_tsn *resp; 2914163953Srrs struct sctp_forward_tsn_chunk fwdtsn; 2915163953Srrs int abort_flag = 0; 2916163953Srrs 2917163953Srrs if (respin == NULL) { 2918163953Srrs /* huh ? */ 2919163953Srrs return (0); 2920163953Srrs } 2921163953Srrs if (action == SCTP_STREAM_RESET_PERFORMED) { 2922163953Srrs resp = (struct sctp_stream_reset_response_tsn *)respin; 2923163953Srrs asoc->stream_reset_outstanding--; 2924163953Srrs fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 2925163953Srrs fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 2926163953Srrs fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 2927163953Srrs sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag); 2928163953Srrs if (abort_flag) { 2929163953Srrs return (1); 2930163953Srrs } 2931163953Srrs stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 2932163953Srrs stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 2933163953Srrs stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 2934163953Srrs memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 2935163953Srrs stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 2936163953Srrs stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 2937163953Srrs 2938163953Srrs sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 2939163953Srrs sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 2940163953Srrs 2941163953Srrs } 2942163953Srrs } 2943163953Srrs /* get rid of the request and get the request flags */ 2944163953Srrs if (asoc->stream_reset_outstanding == 0) { 2945163953Srrs sctp_clean_up_stream_reset(stcb); 2946163953Srrs } 2947163953Srrs } 2948163953Srrs } 2949163953Srrs return (0); 2950163953Srrs} 2951163953Srrs 2952163953Srrsstatic void 2953163953Srrssctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 2954163953Srrs struct sctp_tmit_chunk *chk, 2955163953Srrs struct sctp_stream_reset_in_request *req) 2956163953Srrs{ 2957163953Srrs uint32_t seq; 2958163953Srrs int len, i; 2959163953Srrs int number_entries; 2960163953Srrs uint16_t temp; 2961163953Srrs 2962163953Srrs /* 2963163953Srrs * peer wants me to send a str-reset to him for my outgoing seq's if 2964163953Srrs * seq_in is right. 2965163953Srrs */ 2966163953Srrs struct sctp_association *asoc = &stcb->asoc; 2967163953Srrs 2968163953Srrs seq = ntohl(req->request_seq); 2969163953Srrs if (asoc->str_reset_seq_in == seq) { 2970163953Srrs if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 2971163953Srrs len = ntohs(req->ph.param_length); 2972163953Srrs number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 2973163953Srrs for (i = 0; i < number_entries; i++) { 2974163953Srrs temp = ntohs(req->list_of_streams[i]); 2975163953Srrs req->list_of_streams[i] = temp; 2976163953Srrs } 2977163953Srrs /* move the reset action back one */ 2978163953Srrs asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2979163953Srrs asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 2980163953Srrs sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 2981163953Srrs asoc->str_reset_seq_out, 2982163953Srrs seq, (asoc->sending_seq - 1)); 2983163953Srrs asoc->stream_reset_out_is_outstanding = 1; 2984163953Srrs asoc->str_reset = chk; 2985163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 2986163953Srrs stcb->asoc.stream_reset_outstanding++; 2987163953Srrs } else { 2988163953Srrs /* Can't do it, since we have sent one out */ 2989163953Srrs asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2990163953Srrs asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 2991163953Srrs sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2992163953Srrs } 2993163953Srrs asoc->str_reset_seq_in++; 2994163953Srrs } else if (asoc->str_reset_seq_in - 1 == seq) { 2995163953Srrs sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2996163953Srrs } else if (asoc->str_reset_seq_in - 2 == seq) { 2997163953Srrs sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 2998163953Srrs } else { 2999163953Srrs sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3000163953Srrs } 3001163953Srrs} 3002163953Srrs 3003163953Srrsstatic int 3004163953Srrssctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3005163953Srrs struct sctp_tmit_chunk *chk, 3006163953Srrs struct sctp_stream_reset_tsn_request *req) 3007163953Srrs{ 3008163953Srrs /* reset all in and out and update the tsn */ 3009163953Srrs /* 3010163953Srrs * A) reset my str-seq's on in and out. B) Select a receive next, 3011163953Srrs * and set cum-ack to it. Also process this selected number as a 3012163953Srrs * fwd-tsn as well. C) set in the response my next sending seq. 3013163953Srrs */ 3014163953Srrs struct sctp_forward_tsn_chunk fwdtsn; 3015163953Srrs struct sctp_association *asoc = &stcb->asoc; 3016163953Srrs int abort_flag = 0; 3017163953Srrs uint32_t seq; 3018163953Srrs 3019163953Srrs seq = ntohl(req->request_seq); 3020163953Srrs if (asoc->str_reset_seq_in == seq) { 3021163953Srrs fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3022163953Srrs fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3023163953Srrs fwdtsn.ch.chunk_flags = 0; 3024163953Srrs fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3025163953Srrs sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag); 3026163953Srrs if (abort_flag) { 3027163953Srrs return (1); 3028163953Srrs } 3029163953Srrs stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3030163953Srrs stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3031163953Srrs stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3032163953Srrs memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3033163953Srrs atomic_add_int(&stcb->asoc.sending_seq, 1); 3034163953Srrs /* save off historical data for retrans */ 3035163953Srrs stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3036163953Srrs stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3037163953Srrs stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3038163953Srrs stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3039163953Srrs 3040163953Srrs sctp_add_stream_reset_result_tsn(chk, 3041163953Srrs ntohl(req->request_seq), 3042163953Srrs SCTP_STREAM_RESET_PERFORMED, 3043163953Srrs stcb->asoc.sending_seq, 3044163953Srrs stcb->asoc.mapping_array_base_tsn); 3045163953Srrs sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3046163953Srrs sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3047163953Srrs stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3048163953Srrs stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3049163953Srrs 3050163953Srrs asoc->str_reset_seq_in++; 3051163953Srrs } else if (asoc->str_reset_seq_in - 1 == seq) { 3052163953Srrs sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3053163953Srrs stcb->asoc.last_sending_seq[0], 3054163953Srrs stcb->asoc.last_base_tsnsent[0] 3055163953Srrs ); 3056163953Srrs } else if (asoc->str_reset_seq_in - 2 == seq) { 3057163953Srrs sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3058163953Srrs stcb->asoc.last_sending_seq[1], 3059163953Srrs stcb->asoc.last_base_tsnsent[1] 3060163953Srrs ); 3061163953Srrs } else { 3062163953Srrs sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3063163953Srrs } 3064163953Srrs return (0); 3065163953Srrs} 3066163953Srrs 3067163953Srrsstatic void 3068163953Srrssctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3069163953Srrs struct sctp_tmit_chunk *chk, 3070163953Srrs struct sctp_stream_reset_out_request *req) 3071163953Srrs{ 3072163953Srrs uint32_t seq, tsn; 3073163953Srrs int number_entries, len; 3074163953Srrs struct sctp_association *asoc = &stcb->asoc; 3075163953Srrs 3076163953Srrs seq = ntohl(req->request_seq); 3077163953Srrs 3078163953Srrs /* now if its not a duplicate we process it */ 3079163953Srrs if (asoc->str_reset_seq_in == seq) { 3080163953Srrs len = ntohs(req->ph.param_length); 3081163953Srrs number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3082163953Srrs /* 3083163953Srrs * the sender is resetting, handle the list issue.. we must 3084163953Srrs * a) verify if we can do the reset, if so no problem b) If 3085163953Srrs * we can't do the reset we must copy the request. c) queue 3086163953Srrs * it, and setup the data in processor to trigger it off 3087163953Srrs * when needed and dequeue all the queued data. 3088163953Srrs */ 3089163953Srrs tsn = ntohl(req->send_reset_at_tsn); 3090163953Srrs 3091163953Srrs /* move the reset action back one */ 3092163953Srrs asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3093163953Srrs if ((tsn == asoc->cumulative_tsn) || 3094163953Srrs (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3095163953Srrs /* we can do it now */ 3096163953Srrs sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3097163953Srrs sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3098163953Srrs asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3099163953Srrs } else { 3100163953Srrs /* 3101163953Srrs * we must queue it up and thus wait for the TSN's 3102163953Srrs * to arrive that are at or before tsn 3103163953Srrs */ 3104163953Srrs struct sctp_stream_reset_list *liste; 3105163953Srrs int siz; 3106163953Srrs 3107163953Srrs siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3108163953Srrs SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3109163953Srrs siz, "StrRstList"); 3110163953Srrs if (liste == NULL) { 3111163953Srrs /* gak out of memory */ 3112163953Srrs sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3113163953Srrs asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3114163953Srrs return; 3115163953Srrs } 3116163953Srrs liste->tsn = tsn; 3117163953Srrs liste->number_entries = number_entries; 3118163953Srrs memcpy(&liste->req, req, 3119163953Srrs (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3120163953Srrs TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3121163953Srrs sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3122163953Srrs asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3123163953Srrs } 3124163953Srrs asoc->str_reset_seq_in++; 3125163953Srrs } else if ((asoc->str_reset_seq_in - 1) == seq) { 3126163953Srrs /* 3127163953Srrs * one seq back, just echo back last action since my 3128163953Srrs * response was lost. 3129163953Srrs */ 3130163953Srrs sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3131163953Srrs } else if ((asoc->str_reset_seq_in - 2) == seq) { 3132163953Srrs /* 3133163953Srrs * two seq back, just echo back last action since my 3134163953Srrs * response was lost. 3135163953Srrs */ 3136163953Srrs sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3137163953Srrs } else { 3138163953Srrs sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3139163953Srrs } 3140163953Srrs} 3141163953Srrs 3142163953Srrsstatic int 3143163953Srrssctp_handle_stream_reset(struct sctp_tcb *stcb, struct sctp_stream_reset_out_req *sr_req) 3144163953Srrs{ 3145163953Srrs int chk_length, param_len, ptype; 3146163953Srrs uint32_t seq; 3147163953Srrs int num_req = 0; 3148163953Srrs struct sctp_tmit_chunk *chk; 3149163953Srrs struct sctp_chunkhdr *ch; 3150163953Srrs struct sctp_paramhdr *ph; 3151166675Srrs int ret_code = 0; 3152166675Srrs int num_param = 0; 3153163953Srrs 3154163953Srrs /* now it may be a reset or a reset-response */ 3155163953Srrs chk_length = ntohs(sr_req->ch.chunk_length); 3156163953Srrs 3157163953Srrs /* setup for adding the response */ 3158163953Srrs sctp_alloc_a_chunk(stcb, chk); 3159163953Srrs if (chk == NULL) { 3160163953Srrs return (ret_code); 3161163953Srrs } 3162163953Srrs chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3163163953Srrs chk->asoc = &stcb->asoc; 3164163953Srrs chk->no_fr_allowed = 0; 3165163953Srrs chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3166166023Srrs chk->book_size_scale = 0; 3167165647Srrs chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3168163953Srrs if (chk->data == NULL) { 3169163953Srrsstrres_nochunk: 3170163953Srrs if (chk->data) { 3171163953Srrs sctp_m_freem(chk->data); 3172163953Srrs chk->data = NULL; 3173163953Srrs } 3174163953Srrs sctp_free_a_chunk(stcb, chk); 3175163953Srrs return (ret_code); 3176163953Srrs } 3177165647Srrs SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3178163953Srrs 3179163953Srrs /* setup chunk parameters */ 3180163953Srrs chk->sent = SCTP_DATAGRAM_UNSENT; 3181163953Srrs chk->snd_count = 0; 3182163953Srrs chk->whoTo = stcb->asoc.primary_destination; 3183163953Srrs atomic_add_int(&chk->whoTo->ref_count, 1); 3184163953Srrs 3185163953Srrs ch = mtod(chk->data, struct sctp_chunkhdr *); 3186163953Srrs ch->chunk_type = SCTP_STREAM_RESET; 3187163953Srrs ch->chunk_flags = 0; 3188163953Srrs ch->chunk_length = htons(chk->send_size); 3189165647Srrs SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3190163953Srrs 3191163953Srrs ph = (struct sctp_paramhdr *)&sr_req->sr_req; 3192163953Srrs while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3193163953Srrs param_len = ntohs(ph->param_length); 3194163953Srrs if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3195163953Srrs /* bad param */ 3196163953Srrs break; 3197163953Srrs } 3198163953Srrs ptype = ntohs(ph->param_type); 3199163953Srrs num_param++; 3200163953Srrs if (num_param > SCTP_MAX_RESET_PARAMS) { 3201163953Srrs /* hit the max of parameters already sorry.. */ 3202163953Srrs break; 3203163953Srrs } 3204163953Srrs if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3205163953Srrs struct sctp_stream_reset_out_request *req_out; 3206163953Srrs 3207163953Srrs req_out = (struct sctp_stream_reset_out_request *)ph; 3208163953Srrs num_req++; 3209163953Srrs if (stcb->asoc.stream_reset_outstanding) { 3210163953Srrs seq = ntohl(req_out->response_seq); 3211163953Srrs if (seq == stcb->asoc.str_reset_seq_out) { 3212163953Srrs /* implicit ack */ 3213163953Srrs sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3214163953Srrs } 3215163953Srrs } 3216163953Srrs sctp_handle_str_reset_request_out(stcb, chk, req_out); 3217163953Srrs } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3218163953Srrs struct sctp_stream_reset_in_request *req_in; 3219163953Srrs 3220163953Srrs num_req++; 3221163953Srrs req_in = (struct sctp_stream_reset_in_request *)ph; 3222163953Srrs sctp_handle_str_reset_request_in(stcb, chk, req_in); 3223163953Srrs } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3224163953Srrs struct sctp_stream_reset_tsn_request *req_tsn; 3225163953Srrs 3226163953Srrs num_req++; 3227163953Srrs req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3228163953Srrs if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3229163953Srrs ret_code = 1; 3230163953Srrs goto strres_nochunk; 3231163953Srrs } 3232163953Srrs /* no more */ 3233163953Srrs break; 3234163953Srrs } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3235163953Srrs struct sctp_stream_reset_response *resp; 3236163953Srrs uint32_t result; 3237163953Srrs 3238163953Srrs resp = (struct sctp_stream_reset_response *)ph; 3239163953Srrs seq = ntohl(resp->response_seq); 3240163953Srrs result = ntohl(resp->result); 3241163953Srrs if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3242163953Srrs ret_code = 1; 3243163953Srrs goto strres_nochunk; 3244163953Srrs } 3245163953Srrs } else { 3246163953Srrs break; 3247163953Srrs } 3248163953Srrs 3249163953Srrs ph = (struct sctp_paramhdr *)((caddr_t)ph + SCTP_SIZE32(param_len)); 3250163953Srrs chk_length -= SCTP_SIZE32(param_len); 3251163953Srrs } 3252163953Srrs if (num_req == 0) { 3253163953Srrs /* we have no response free the stuff */ 3254163953Srrs goto strres_nochunk; 3255163953Srrs } 3256163953Srrs /* ok we have a chunk to link in */ 3257163953Srrs TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3258163953Srrs chk, 3259163953Srrs sctp_next); 3260163953Srrs stcb->asoc.ctrl_queue_cnt++; 3261163953Srrs return (ret_code); 3262163953Srrs} 3263163953Srrs 3264163953Srrs/* 3265163953Srrs * Handle a router or endpoints report of a packet loss, there are two ways 3266163953Srrs * to handle this, either we get the whole packet and must disect it 3267163953Srrs * ourselves (possibly with truncation and or corruption) or it is a summary 3268163953Srrs * from a middle box that did the disectting for us. 3269163953Srrs */ 3270163953Srrsstatic void 3271163953Srrssctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3272163953Srrs struct sctp_tcb *stcb, struct sctp_nets *net) 3273163953Srrs{ 3274163953Srrs uint32_t bottle_bw, on_queue; 3275163953Srrs uint16_t trunc_len; 3276163953Srrs unsigned int chlen; 3277163953Srrs unsigned int at; 3278163953Srrs struct sctp_chunk_desc desc; 3279163953Srrs struct sctp_chunkhdr *ch; 3280163953Srrs 3281163953Srrs chlen = ntohs(cp->ch.chunk_length); 3282163953Srrs chlen -= sizeof(struct sctp_pktdrop_chunk); 3283163953Srrs /* XXX possible chlen underflow */ 3284163953Srrs if (chlen == 0) { 3285163953Srrs ch = NULL; 3286163953Srrs if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3287163953Srrs SCTP_STAT_INCR(sctps_pdrpbwrpt); 3288163953Srrs } else { 3289163953Srrs ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3290163953Srrs chlen -= sizeof(struct sctphdr); 3291163953Srrs /* XXX possible chlen underflow */ 3292163953Srrs memset(&desc, 0, sizeof(desc)); 3293163953Srrs } 3294163953Srrs trunc_len = (uint16_t) ntohs(cp->trunc_len); 3295163953Srrs /* now the chunks themselves */ 3296163953Srrs while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 3297163953Srrs desc.chunk_type = ch->chunk_type; 3298163953Srrs /* get amount we need to move */ 3299163953Srrs at = ntohs(ch->chunk_length); 3300163953Srrs if (at < sizeof(struct sctp_chunkhdr)) { 3301163953Srrs /* corrupt chunk, maybe at the end? */ 3302163953Srrs SCTP_STAT_INCR(sctps_pdrpcrupt); 3303163953Srrs break; 3304163953Srrs } 3305163953Srrs if (trunc_len == 0) { 3306163953Srrs /* we are supposed to have all of it */ 3307163953Srrs if (at > chlen) { 3308163953Srrs /* corrupt skip it */ 3309163953Srrs SCTP_STAT_INCR(sctps_pdrpcrupt); 3310163953Srrs break; 3311163953Srrs } 3312163953Srrs } else { 3313163953Srrs /* is there enough of it left ? */ 3314163953Srrs if (desc.chunk_type == SCTP_DATA) { 3315163953Srrs if (chlen < (sizeof(struct sctp_data_chunk) + 3316163953Srrs sizeof(desc.data_bytes))) { 3317163953Srrs break; 3318163953Srrs } 3319163953Srrs } else { 3320163953Srrs if (chlen < sizeof(struct sctp_chunkhdr)) { 3321163953Srrs break; 3322163953Srrs } 3323163953Srrs } 3324163953Srrs } 3325163953Srrs if (desc.chunk_type == SCTP_DATA) { 3326163953Srrs /* can we get out the tsn? */ 3327163953Srrs if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3328163953Srrs SCTP_STAT_INCR(sctps_pdrpmbda); 3329163953Srrs 3330163953Srrs if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 3331163953Srrs /* yep */ 3332163953Srrs struct sctp_data_chunk *dcp; 3333163953Srrs uint8_t *ddp; 3334163953Srrs unsigned int iii; 3335163953Srrs 3336163953Srrs dcp = (struct sctp_data_chunk *)ch; 3337163953Srrs ddp = (uint8_t *) (dcp + 1); 3338163953Srrs for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 3339163953Srrs desc.data_bytes[iii] = ddp[iii]; 3340163953Srrs } 3341163953Srrs desc.tsn_ifany = dcp->dp.tsn; 3342163953Srrs } else { 3343163953Srrs /* nope we are done. */ 3344163953Srrs SCTP_STAT_INCR(sctps_pdrpnedat); 3345163953Srrs break; 3346163953Srrs } 3347163953Srrs } else { 3348163953Srrs if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3349163953Srrs SCTP_STAT_INCR(sctps_pdrpmbct); 3350163953Srrs } 3351163953Srrs 3352163953Srrs if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 3353163953Srrs SCTP_STAT_INCR(sctps_pdrppdbrk); 3354163953Srrs break; 3355163953Srrs } 3356163953Srrs if (SCTP_SIZE32(at) > chlen) { 3357163953Srrs break; 3358163953Srrs } 3359163953Srrs chlen -= SCTP_SIZE32(at); 3360163953Srrs if (chlen < sizeof(struct sctp_chunkhdr)) { 3361163953Srrs /* done, none left */ 3362163953Srrs break; 3363163953Srrs } 3364163953Srrs ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 3365163953Srrs } 3366163953Srrs /* Now update any rwnd --- possibly */ 3367163953Srrs if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 3368163953Srrs /* From a peer, we get a rwnd report */ 3369163953Srrs uint32_t a_rwnd; 3370163953Srrs 3371163953Srrs SCTP_STAT_INCR(sctps_pdrpfehos); 3372163953Srrs 3373163953Srrs bottle_bw = ntohl(cp->bottle_bw); 3374163953Srrs on_queue = ntohl(cp->current_onq); 3375163953Srrs if (bottle_bw && on_queue) { 3376163953Srrs /* a rwnd report is in here */ 3377163953Srrs if (bottle_bw > on_queue) 3378163953Srrs a_rwnd = bottle_bw - on_queue; 3379163953Srrs else 3380163953Srrs a_rwnd = 0; 3381163953Srrs 3382163953Srrs if (a_rwnd == 0) 3383163953Srrs stcb->asoc.peers_rwnd = 0; 3384163953Srrs else { 3385163953Srrs if (a_rwnd > stcb->asoc.total_flight) { 3386163953Srrs stcb->asoc.peers_rwnd = 3387163953Srrs a_rwnd - stcb->asoc.total_flight; 3388163953Srrs } else { 3389163953Srrs stcb->asoc.peers_rwnd = 0; 3390163953Srrs } 3391163953Srrs if (stcb->asoc.peers_rwnd < 3392163953Srrs stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3393163953Srrs /* SWS sender side engages */ 3394163953Srrs stcb->asoc.peers_rwnd = 0; 3395163953Srrs } 3396163953Srrs } 3397163953Srrs } 3398163953Srrs } else { 3399163953Srrs SCTP_STAT_INCR(sctps_pdrpfmbox); 3400163953Srrs } 3401163953Srrs 3402163953Srrs /* now middle boxes in sat networks get a cwnd bump */ 3403163953Srrs if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 3404163953Srrs (stcb->asoc.sat_t3_loss_recovery == 0) && 3405163953Srrs (stcb->asoc.sat_network)) { 3406163953Srrs /* 3407163953Srrs * This is debateable but for sat networks it makes sense 3408163953Srrs * Note if a T3 timer has went off, we will prohibit any 3409163953Srrs * changes to cwnd until we exit the t3 loss recovery. 3410163953Srrs */ 3411163953Srrs uint32_t bw_avail; 3412163953Srrs int rtt, incr; 3413163953Srrs 3414163953Srrs#ifdef SCTP_CWND_MONITOR 3415163953Srrs int old_cwnd = net->cwnd; 3416163953Srrs 3417163953Srrs#endif 3418163953Srrs /* need real RTT for this calc */ 3419163953Srrs rtt = ((net->lastsa >> 2) + net->lastsv) >> 1; 3420163953Srrs /* get bottle neck bw */ 3421163953Srrs bottle_bw = ntohl(cp->bottle_bw); 3422163953Srrs /* and whats on queue */ 3423163953Srrs on_queue = ntohl(cp->current_onq); 3424163953Srrs /* 3425163953Srrs * adjust the on-queue if our flight is more it could be 3426163953Srrs * that the router has not yet gotten data "in-flight" to it 3427163953Srrs */ 3428163953Srrs if (on_queue < net->flight_size) 3429163953Srrs on_queue = net->flight_size; 3430163953Srrs 3431163953Srrs /* calculate the available space */ 3432163953Srrs bw_avail = (bottle_bw * rtt) / 1000; 3433163953Srrs if (bw_avail > bottle_bw) { 3434163953Srrs /* 3435163953Srrs * Cap the growth to no more than the bottle neck. 3436163953Srrs * This can happen as RTT slides up due to queues. 3437163953Srrs * It also means if you have more than a 1 second 3438163953Srrs * RTT with a empty queue you will be limited to the 3439163953Srrs * bottle_bw per second no matter if other points 3440163953Srrs * have 1/2 the RTT and you could get more out... 3441163953Srrs */ 3442163953Srrs bw_avail = bottle_bw; 3443163953Srrs } 3444163953Srrs if (on_queue > bw_avail) { 3445163953Srrs /* 3446163953Srrs * No room for anything else don't allow anything 3447163953Srrs * else to be "added to the fire". 3448163953Srrs */ 3449163953Srrs int seg_inflight, seg_onqueue, my_portion; 3450163953Srrs 3451163953Srrs net->partial_bytes_acked = 0; 3452163953Srrs 3453163953Srrs /* how much are we over queue size? */ 3454163953Srrs incr = on_queue - bw_avail; 3455163953Srrs if (stcb->asoc.seen_a_sack_this_pkt) { 3456163953Srrs /* 3457163953Srrs * undo any cwnd adjustment that the sack 3458163953Srrs * might have made 3459163953Srrs */ 3460163953Srrs net->cwnd = net->prev_cwnd; 3461163953Srrs } 3462163953Srrs /* Now how much of that is mine? */ 3463163953Srrs seg_inflight = net->flight_size / net->mtu; 3464163953Srrs seg_onqueue = on_queue / net->mtu; 3465163953Srrs my_portion = (incr * seg_inflight) / seg_onqueue; 3466163953Srrs 3467163953Srrs /* Have I made an adjustment already */ 3468163953Srrs if (net->cwnd > net->flight_size) { 3469163953Srrs /* 3470163953Srrs * for this flight I made an adjustment we 3471163953Srrs * need to decrease the portion by a share 3472163953Srrs * our previous adjustment. 3473163953Srrs */ 3474163953Srrs int diff_adj; 3475163953Srrs 3476163953Srrs diff_adj = net->cwnd - net->flight_size; 3477163953Srrs if (diff_adj > my_portion) 3478163953Srrs my_portion = 0; 3479163953Srrs else 3480163953Srrs my_portion -= diff_adj; 3481163953Srrs } 3482163953Srrs /* 3483163953Srrs * back down to the previous cwnd (assume we have 3484163953Srrs * had a sack before this packet). minus what ever 3485163953Srrs * portion of the overage is my fault. 3486163953Srrs */ 3487163953Srrs net->cwnd -= my_portion; 3488163953Srrs 3489163953Srrs /* we will NOT back down more than 1 MTU */ 3490163953Srrs if (net->cwnd <= net->mtu) { 3491163953Srrs net->cwnd = net->mtu; 3492163953Srrs } 3493163953Srrs /* force into CA */ 3494163953Srrs net->ssthresh = net->cwnd - 1; 3495163953Srrs } else { 3496163953Srrs /* 3497163953Srrs * Take 1/4 of the space left or max burst up .. 3498163953Srrs * whichever is less. 3499163953Srrs */ 3500163953Srrs incr = min((bw_avail - on_queue) >> 2, 3501163953Srrs (int)stcb->asoc.max_burst * (int)net->mtu); 3502163953Srrs net->cwnd += incr; 3503163953Srrs } 3504163953Srrs if (net->cwnd > bw_avail) { 3505163953Srrs /* We can't exceed the pipe size */ 3506163953Srrs net->cwnd = bw_avail; 3507163953Srrs } 3508163953Srrs if (net->cwnd < net->mtu) { 3509163953Srrs /* We always have 1 MTU */ 3510163953Srrs net->cwnd = net->mtu; 3511163953Srrs } 3512163953Srrs#ifdef SCTP_CWND_MONITOR 3513163953Srrs if (net->cwnd - old_cwnd != 0) { 3514163953Srrs /* log only changes */ 3515163953Srrs sctp_log_cwnd(stcb, net, (net->cwnd - old_cwnd), 3516163953Srrs SCTP_CWND_LOG_FROM_SAT); 3517163953Srrs } 3518163953Srrs#endif 3519163953Srrs } 3520163953Srrs} 3521163953Srrs 3522163953Srrs/* 3523163953Srrs * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 3524163953Srrs * still contain IP/SCTP header - stcb: is the tcb found for this packet - 3525163953Srrs * offset: offset into the mbuf chain to first chunkhdr - length: is the 3526163953Srrs * length of the complete packet outputs: - length: modified to remaining 3527163953Srrs * length after control processing - netp: modified to new sctp_nets after 3528163953Srrs * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 3529163953Srrs * bad packet,...) otherwise return the tcb for this packet 3530163953Srrs */ 3531163953Srrsstatic struct sctp_tcb * 3532163953Srrssctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 3533163953Srrs struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 3534163953Srrs struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen) 3535163953Srrs{ 3536163953Srrs struct sctp_association *asoc; 3537163953Srrs uint32_t vtag_in; 3538163953Srrs int num_chunks = 0; /* number of control chunks processed */ 3539163953Srrs int chk_length; 3540163953Srrs int ret; 3541168299Srrs int abort_no_unlock = 0; 3542163953Srrs 3543163953Srrs /* 3544163953Srrs * How big should this be, and should it be alloc'd? Lets try the 3545163953Srrs * d-mtu-ceiling for now (2k) and that should hopefully work ... 3546163953Srrs * until we get into jumbo grams and such.. 3547163953Srrs */ 3548166675Srrs uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 3549163953Srrs struct sctp_tcb *locked_tcb = stcb; 3550163953Srrs int got_auth = 0; 3551163953Srrs uint32_t auth_offset = 0, auth_len = 0; 3552163953Srrs int auth_skipped = 0; 3553163953Srrs 3554163953Srrs#ifdef SCTP_DEBUG 3555163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 3556163953Srrs printf("sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 3557163953Srrs iphlen, *offset, length, stcb); 3558163953Srrs } 3559163953Srrs#endif /* SCTP_DEBUG */ 3560163953Srrs 3561163953Srrs /* validate chunk header length... */ 3562163953Srrs if (ntohs(ch->chunk_length) < sizeof(*ch)) { 3563163953Srrs return (NULL); 3564163953Srrs } 3565163953Srrs /* 3566163953Srrs * validate the verification tag 3567163953Srrs */ 3568163953Srrs vtag_in = ntohl(sh->v_tag); 3569163953Srrs 3570165220Srrs if (locked_tcb) { 3571165220Srrs SCTP_TCB_LOCK_ASSERT(locked_tcb); 3572165220Srrs } 3573163953Srrs if (ch->chunk_type == SCTP_INITIATION) { 3574163953Srrs if (vtag_in != 0) { 3575163953Srrs /* protocol error- silently discard... */ 3576163953Srrs SCTP_STAT_INCR(sctps_badvtag); 3577163953Srrs if (locked_tcb) 3578163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3579163953Srrs return (NULL); 3580163953Srrs } 3581163953Srrs } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 3582163953Srrs /* 3583163953Srrs * If there is no stcb, skip the AUTH chunk and process 3584163953Srrs * later after a stcb is found (to validate the lookup was 3585163953Srrs * valid. 3586163953Srrs */ 3587163953Srrs if ((ch->chunk_type == SCTP_AUTHENTICATION) && 3588163953Srrs (stcb == NULL) && !sctp_auth_disable) { 3589163953Srrs /* save this chunk for later processing */ 3590163953Srrs auth_skipped = 1; 3591163953Srrs auth_offset = *offset; 3592163953Srrs auth_len = ntohs(ch->chunk_length); 3593163953Srrs 3594163953Srrs /* (temporarily) move past this chunk */ 3595163953Srrs *offset += SCTP_SIZE32(auth_len); 3596163953Srrs if (*offset >= length) { 3597163953Srrs /* no more data left in the mbuf chain */ 3598163953Srrs *offset = length; 3599163953Srrs return (NULL); 3600163953Srrs } 3601163953Srrs ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3602163953Srrs sizeof(struct sctp_chunkhdr), chunk_buf); 3603163953Srrs } 3604163953Srrs if (ch->chunk_type == SCTP_COOKIE_ECHO) { 3605163953Srrs goto process_control_chunks; 3606163953Srrs } 3607163953Srrs /* 3608163953Srrs * first check if it's an ASCONF with an unknown src addr we 3609163953Srrs * need to look inside to find the association 3610163953Srrs */ 3611163953Srrs if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 3612163953Srrs /* inp's refcount may be reduced */ 3613163953Srrs SCTP_INP_INCR_REF(inp); 3614163953Srrs 3615163953Srrs stcb = sctp_findassociation_ep_asconf(m, iphlen, 3616163953Srrs *offset, sh, &inp, netp); 3617163953Srrs if (stcb == NULL) { 3618163953Srrs /* 3619163953Srrs * reduce inp's refcount if not reduced in 3620163953Srrs * sctp_findassociation_ep_asconf(). 3621163953Srrs */ 3622163953Srrs SCTP_INP_DECR_REF(inp); 3623163953Srrs } 3624163953Srrs /* now go back and verify any auth chunk to be sure */ 3625163953Srrs if (auth_skipped && (stcb != NULL)) { 3626163953Srrs struct sctp_auth_chunk *auth; 3627163953Srrs 3628163953Srrs auth = (struct sctp_auth_chunk *) 3629163953Srrs sctp_m_getptr(m, auth_offset, 3630163953Srrs auth_len, chunk_buf); 3631163953Srrs got_auth = 1; 3632163953Srrs auth_skipped = 0; 3633163953Srrs if (sctp_handle_auth(stcb, auth, m, 3634163953Srrs auth_offset)) { 3635163953Srrs /* auth HMAC failed so dump it */ 3636163953Srrs *offset = length; 3637163953Srrs return (NULL); 3638163953Srrs } else { 3639163953Srrs /* remaining chunks are HMAC checked */ 3640163953Srrs stcb->asoc.authenticated = 1; 3641163953Srrs } 3642163953Srrs } 3643163953Srrs } 3644163953Srrs if (stcb == NULL) { 3645163953Srrs /* no association, so it's out of the blue... */ 3646163953Srrs sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL); 3647163953Srrs *offset = length; 3648163953Srrs if (locked_tcb) 3649163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3650163953Srrs return (NULL); 3651163953Srrs } 3652163953Srrs asoc = &stcb->asoc; 3653163953Srrs /* ABORT and SHUTDOWN can use either v_tag... */ 3654163953Srrs if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 3655163953Srrs (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 3656163953Srrs (ch->chunk_type == SCTP_PACKET_DROPPED)) { 3657163953Srrs if ((vtag_in == asoc->my_vtag) || 3658163953Srrs ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 3659163953Srrs (vtag_in == asoc->peer_vtag))) { 3660163953Srrs /* this is valid */ 3661163953Srrs } else { 3662163953Srrs /* drop this packet... */ 3663163953Srrs SCTP_STAT_INCR(sctps_badvtag); 3664163953Srrs if (locked_tcb) 3665163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3666163953Srrs return (NULL); 3667163953Srrs } 3668163953Srrs } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 3669163953Srrs if (vtag_in != asoc->my_vtag) { 3670163953Srrs /* 3671163953Srrs * this could be a stale SHUTDOWN-ACK or the 3672163953Srrs * peer never got the SHUTDOWN-COMPLETE and 3673163953Srrs * is still hung; we have started a new asoc 3674163953Srrs * but it won't complete until the shutdown 3675163953Srrs * is completed 3676163953Srrs */ 3677163953Srrs if (locked_tcb) 3678163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3679163953Srrs sctp_handle_ootb(m, iphlen, *offset, sh, inp, 3680163953Srrs NULL); 3681163953Srrs return (NULL); 3682163953Srrs } 3683163953Srrs } else { 3684163953Srrs /* for all other chunks, vtag must match */ 3685163953Srrs if (vtag_in != asoc->my_vtag) { 3686163953Srrs /* invalid vtag... */ 3687163953Srrs#ifdef SCTP_DEBUG 3688163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3689163953Srrs printf("invalid vtag: %xh, expect %xh\n", vtag_in, asoc->my_vtag); 3690163953Srrs } 3691163953Srrs#endif /* SCTP_DEBUG */ 3692163953Srrs SCTP_STAT_INCR(sctps_badvtag); 3693163953Srrs if (locked_tcb) 3694163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3695163953Srrs *offset = length; 3696163953Srrs return (NULL); 3697163953Srrs } 3698163953Srrs } 3699163953Srrs } /* end if !SCTP_COOKIE_ECHO */ 3700163953Srrs /* 3701163953Srrs * process all control chunks... 3702163953Srrs */ 3703163953Srrs if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 3704163953Srrs (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 3705163953Srrs (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 3706163953Srrs /* implied cookie-ack.. we must have lost the ack */ 3707163953Srrs stcb->asoc.overall_error_count = 0; 3708163953Srrs sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 3709163953Srrs *netp); 3710163953Srrs } 3711163953Srrsprocess_control_chunks: 3712163953Srrs 3713163953Srrs while (IS_SCTP_CONTROL(ch)) { 3714163953Srrs /* validate chunk length */ 3715163953Srrs chk_length = ntohs(ch->chunk_length); 3716163953Srrs#ifdef SCTP_DEBUG 3717163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT2) { 3718163953Srrs printf("sctp_process_control: processing a chunk type=%u, len=%u\n", 3719163953Srrs ch->chunk_type, chk_length); 3720163953Srrs } 3721163953Srrs#endif /* SCTP_DEBUG */ 3722163953Srrs if ((size_t)chk_length < sizeof(*ch) || 3723163953Srrs (*offset + chk_length) > length) { 3724163953Srrs *offset = length; 3725163953Srrs if (locked_tcb) 3726163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3727163953Srrs return (NULL); 3728163953Srrs } 3729163953Srrs SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 3730163953Srrs /* 3731163953Srrs * INIT-ACK only gets the init ack "header" portion only 3732163953Srrs * because we don't have to process the peer's COOKIE. All 3733163953Srrs * others get a complete chunk. 3734163953Srrs */ 3735163953Srrs if (ch->chunk_type == SCTP_INITIATION_ACK) { 3736163953Srrs /* get an init-ack chunk */ 3737163953Srrs ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3738163953Srrs sizeof(struct sctp_init_ack_chunk), chunk_buf); 3739163953Srrs if (ch == NULL) { 3740163953Srrs *offset = length; 3741163953Srrs if (locked_tcb) 3742163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3743163953Srrs return (NULL); 3744163953Srrs } 3745163953Srrs } else { 3746163953Srrs /* get a complete chunk... */ 3747163953Srrs if ((size_t)chk_length > sizeof(chunk_buf)) { 3748163953Srrs struct mbuf *oper; 3749163953Srrs struct sctp_paramhdr *phdr; 3750163953Srrs 3751163953Srrs oper = NULL; 3752163953Srrs oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 3753165647Srrs 0, M_DONTWAIT, 1, MT_DATA); 3754163953Srrs if (oper) { 3755163953Srrs /* pre-reserve some space */ 3756165647Srrs SCTP_BUF_RESV_UF(oper, sizeof(struct sctp_chunkhdr)); 3757165647Srrs SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr); 3758163953Srrs phdr = mtod(oper, struct sctp_paramhdr *); 3759163953Srrs phdr->param_type = htons(SCTP_CAUSE_OUT_OF_RESC); 3760163953Srrs phdr->param_length = htons(sizeof(struct sctp_paramhdr)); 3761163953Srrs sctp_queue_op_err(stcb, oper); 3762163953Srrs } 3763163953Srrs if (locked_tcb) 3764163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3765163953Srrs return (NULL); 3766163953Srrs } 3767163953Srrs ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3768163953Srrs chk_length, chunk_buf); 3769163953Srrs if (ch == NULL) { 3770163953Srrs printf("sctp_process_control: Can't get the all data....\n"); 3771163953Srrs *offset = length; 3772163953Srrs if (locked_tcb) 3773163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3774163953Srrs return (NULL); 3775163953Srrs } 3776163953Srrs } 3777163953Srrs num_chunks++; 3778163953Srrs /* Save off the last place we got a control from */ 3779163953Srrs if (stcb != NULL) { 3780163953Srrs if ((*netp != NULL) || (ch->chunk_type == SCTP_ASCONF)) { 3781163953Srrs /* 3782163953Srrs * allow last_control to be NULL if 3783163953Srrs * ASCONF... ASCONF processing will find the 3784163953Srrs * right net later 3785163953Srrs */ 3786163953Srrs stcb->asoc.last_control_chunk_from = *netp; 3787163953Srrs } 3788163953Srrs } 3789163953Srrs#ifdef SCTP_AUDITING_ENABLED 3790163953Srrs sctp_audit_log(0xB0, ch->chunk_type); 3791163953Srrs#endif 3792163953Srrs 3793163953Srrs /* check to see if this chunk required auth, but isn't */ 3794163953Srrs if ((stcb != NULL) && !sctp_auth_disable && 3795163953Srrs sctp_auth_is_required_chunk(ch->chunk_type, 3796163953Srrs stcb->asoc.local_auth_chunks) && 3797163953Srrs !stcb->asoc.authenticated) { 3798163953Srrs /* "silently" ignore */ 3799163953Srrs SCTP_STAT_INCR(sctps_recvauthmissing); 3800163953Srrs goto next_chunk; 3801163953Srrs } 3802163953Srrs switch (ch->chunk_type) { 3803163953Srrs case SCTP_INITIATION: 3804163953Srrs /* must be first and only chunk */ 3805163953Srrs#ifdef SCTP_DEBUG 3806163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3807163953Srrs printf("SCTP_INIT\n"); 3808163953Srrs } 3809163953Srrs#endif /* SCTP_DEBUG */ 3810163953Srrs if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3811163953Srrs /* We are not interested anymore? */ 3812163953Srrs if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3813163953Srrs /* 3814163953Srrs * collision case where we are 3815163953Srrs * sending to them too 3816163953Srrs */ 3817163953Srrs ; 3818163953Srrs } else { 3819163953Srrs if (locked_tcb) 3820163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3821163953Srrs *offset = length; 3822163953Srrs return (NULL); 3823163953Srrs } 3824163953Srrs } 3825163953Srrs if ((num_chunks > 1) || 3826163953Srrs (sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) { 3827163953Srrs *offset = length; 3828163953Srrs if (locked_tcb) 3829163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3830163953Srrs return (NULL); 3831163953Srrs } 3832163953Srrs if ((stcb != NULL) && 3833163953Srrs (SCTP_GET_STATE(&stcb->asoc) == 3834163953Srrs SCTP_STATE_SHUTDOWN_ACK_SENT)) { 3835163953Srrs sctp_send_shutdown_ack(stcb, 3836163953Srrs stcb->asoc.primary_destination); 3837163953Srrs *offset = length; 3838163953Srrs sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3839163953Srrs if (locked_tcb) 3840163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3841163953Srrs return (NULL); 3842163953Srrs } 3843163953Srrs sctp_handle_init(m, iphlen, *offset, sh, 3844168299Srrs (struct sctp_init_chunk *)ch, inp, stcb, *netp, &abort_no_unlock); 3845168299Srrs if (abort_no_unlock) 3846168299Srrs return (NULL); 3847168299Srrs 3848163953Srrs *offset = length; 3849163953Srrs if (locked_tcb) 3850163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3851163953Srrs return (NULL); 3852163953Srrs break; 3853163953Srrs case SCTP_INITIATION_ACK: 3854163953Srrs /* must be first and only chunk */ 3855163953Srrs#ifdef SCTP_DEBUG 3856163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3857163953Srrs printf("SCTP_INIT-ACK\n"); 3858163953Srrs } 3859163953Srrs#endif /* SCTP_DEBUG */ 3860163953Srrs if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3861163953Srrs /* We are not interested anymore */ 3862163953Srrs if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3863163953Srrs ; 3864163953Srrs } else { 3865163953Srrs if (locked_tcb) 3866163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3867163953Srrs *offset = length; 3868163953Srrs if (stcb) { 3869165220Srrs sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3870163953Srrs } 3871163953Srrs return (NULL); 3872163953Srrs } 3873163953Srrs } 3874163953Srrs if ((num_chunks > 1) || 3875163953Srrs (sctp_strict_init && (length - *offset > SCTP_SIZE32(chk_length)))) { 3876163953Srrs *offset = length; 3877163953Srrs if (locked_tcb) 3878163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3879163953Srrs return (NULL); 3880163953Srrs } 3881163953Srrs ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 3882168299Srrs (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 3883163953Srrs /* 3884163953Srrs * Special case, I must call the output routine to 3885163953Srrs * get the cookie echoed 3886163953Srrs */ 3887168299Srrs if (abort_no_unlock) 3888168299Srrs return (NULL); 3889168299Srrs 3890163953Srrs if ((stcb) && ret == 0) 3891163953Srrs sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3892163953Srrs *offset = length; 3893163953Srrs if (locked_tcb) 3894163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 3895163953Srrs return (NULL); 3896163953Srrs break; 3897163953Srrs case SCTP_SELECTIVE_ACK: 3898163953Srrs#ifdef SCTP_DEBUG 3899163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3900163953Srrs printf("SCTP_SACK\n"); 3901163953Srrs } 3902163953Srrs#endif /* SCTP_DEBUG */ 3903163953Srrs SCTP_STAT_INCR(sctps_recvsacks); 3904163953Srrs { 3905163953Srrs struct sctp_sack_chunk *sack; 3906163953Srrs int abort_now = 0; 3907163953Srrs uint32_t a_rwnd, cum_ack; 3908163953Srrs uint16_t num_seg; 3909163953Srrs int nonce_sum_flag; 3910163953Srrs 3911163953Srrs sack = (struct sctp_sack_chunk *)ch; 3912163953Srrs 3913163953Srrs nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 3914163953Srrs cum_ack = ntohl(sack->sack.cum_tsn_ack); 3915163953Srrs num_seg = ntohs(sack->sack.num_gap_ack_blks); 3916163953Srrs a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 3917163953Srrs stcb->asoc.seen_a_sack_this_pkt = 1; 3918163953Srrs if ((stcb->asoc.pr_sctp_cnt == 0) && 3919163953Srrs (num_seg == 0) && 3920163953Srrs ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 3921163953Srrs (cum_ack == stcb->asoc.last_acked_seq)) && 3922163953Srrs (stcb->asoc.saw_sack_with_frags == 0) && 3923163953Srrs (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 3924163953Srrs ) { 3925163953Srrs /* 3926163953Srrs * We have a SIMPLE sack having no 3927163953Srrs * prior segments and data on sent 3928163953Srrs * queue to be acked.. Use the 3929163953Srrs * faster path sack processing. We 3930163953Srrs * also allow window update sacks 3931163953Srrs * with no missing segments to go 3932163953Srrs * this way too. 3933163953Srrs */ 3934163953Srrs sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, &abort_now); 3935163953Srrs } else { 3936163953Srrs sctp_handle_sack(sack, stcb, *netp, &abort_now); 3937163953Srrs } 3938163953Srrs if (abort_now) { 3939163953Srrs /* ABORT signal from sack processing */ 3940163953Srrs *offset = length; 3941163953Srrs return (NULL); 3942163953Srrs } 3943163953Srrs } 3944163953Srrs break; 3945163953Srrs case SCTP_HEARTBEAT_REQUEST: 3946163953Srrs#ifdef SCTP_DEBUG 3947163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3948163953Srrs printf("SCTP_HEARTBEAT\n"); 3949163953Srrs } 3950163953Srrs#endif /* SCTP_DEBUG */ 3951163953Srrs SCTP_STAT_INCR(sctps_recvheartbeat); 3952163953Srrs sctp_send_heartbeat_ack(stcb, m, *offset, chk_length, 3953163953Srrs *netp); 3954163953Srrs 3955163953Srrs /* He's alive so give him credit */ 3956163953Srrs stcb->asoc.overall_error_count = 0; 3957163953Srrs break; 3958163953Srrs case SCTP_HEARTBEAT_ACK: 3959163953Srrs#ifdef SCTP_DEBUG 3960163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3961163953Srrs printf("SCTP_HEARTBEAT-ACK\n"); 3962163953Srrs } 3963163953Srrs#endif /* SCTP_DEBUG */ 3964163953Srrs 3965163953Srrs /* He's alive so give him credit */ 3966163953Srrs stcb->asoc.overall_error_count = 0; 3967163953Srrs SCTP_STAT_INCR(sctps_recvheartbeatack); 3968163953Srrs sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 3969163953Srrs stcb, *netp); 3970163953Srrs break; 3971163953Srrs case SCTP_ABORT_ASSOCIATION: 3972163953Srrs#ifdef SCTP_DEBUG 3973163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3974163953Srrs printf("SCTP_ABORT\n"); 3975163953Srrs } 3976163953Srrs#endif /* SCTP_DEBUG */ 3977163953Srrs sctp_handle_abort((struct sctp_abort_chunk *)ch, 3978163953Srrs stcb, *netp); 3979163953Srrs *offset = length; 3980163953Srrs return (NULL); 3981163953Srrs break; 3982163953Srrs case SCTP_SHUTDOWN: 3983163953Srrs#ifdef SCTP_DEBUG 3984163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 3985163953Srrs printf("SCTP_SHUTDOWN\n"); 3986163953Srrs } 3987163953Srrs#endif /* SCTP_DEBUG */ 3988163953Srrs { 3989163953Srrs int abort_flag = 0; 3990163953Srrs 3991163953Srrs sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 3992163953Srrs stcb, *netp, &abort_flag); 3993163953Srrs if (abort_flag) { 3994163953Srrs *offset = length; 3995163953Srrs return (NULL); 3996163953Srrs } 3997163953Srrs } 3998163953Srrs break; 3999163953Srrs case SCTP_SHUTDOWN_ACK: 4000163953Srrs#ifdef SCTP_DEBUG 4001163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4002163953Srrs printf("SCTP_SHUTDOWN-ACK\n"); 4003163953Srrs } 4004163953Srrs#endif /* SCTP_DEBUG */ 4005163953Srrs sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4006163953Srrs *offset = length; 4007163953Srrs return (NULL); 4008163953Srrs break; 4009163953Srrs case SCTP_OPERATION_ERROR: 4010163953Srrs#ifdef SCTP_DEBUG 4011163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4012163953Srrs printf("SCTP_OP-ERR\n"); 4013163953Srrs } 4014163953Srrs#endif /* SCTP_DEBUG */ 4015163953Srrs if (sctp_handle_error(ch, stcb, *netp) < 0) { 4016163953Srrs *offset = length; 4017163953Srrs return (NULL); 4018163953Srrs } 4019163953Srrs break; 4020163953Srrs case SCTP_COOKIE_ECHO: 4021163953Srrs#ifdef SCTP_DEBUG 4022163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4023163953Srrs printf("SCTP_COOKIE-ECHO stcb is %p\n", stcb); 4024163953Srrs } 4025163953Srrs#endif /* SCTP_DEBUG */ 4026163953Srrs if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4027163953Srrs ; 4028163953Srrs } else { 4029163953Srrs if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) && 4030163953Srrs (stcb == NULL)) { 4031163953Srrs /* We are not interested anymore */ 4032163953Srrs *offset = length; 4033163953Srrs return (NULL); 4034163953Srrs } 4035163953Srrs } 4036163953Srrs /* 4037163953Srrs * First are we accepting? We do this again here 4038163953Srrs * since it is possible that a previous endpoint WAS 4039163953Srrs * listening responded to a INIT-ACK and then 4040163953Srrs * closed. We opened and bound.. and are now no 4041163953Srrs * longer listening. 4042163953Srrs */ 4043163953Srrs if (inp->sctp_socket->so_qlimit == 0) { 4044163953Srrs if ((stcb) && (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 4045163953Srrs /* 4046163953Srrs * special case, is this a retran'd 4047163953Srrs * COOKIE-ECHO or a restarting assoc 4048163953Srrs * that is a peeled off or 4049163953Srrs * one-to-one style socket. 4050163953Srrs */ 4051163953Srrs goto process_cookie_anyway; 4052163953Srrs } 4053163953Srrs sctp_abort_association(inp, stcb, m, iphlen, sh, 4054163953Srrs NULL); 4055163953Srrs *offset = length; 4056163953Srrs return (NULL); 4057163953Srrs } else if (inp->sctp_socket->so_qlimit) { 4058163953Srrs /* we are accepting so check limits like TCP */ 4059163953Srrs if (inp->sctp_socket->so_qlen > 4060163953Srrs inp->sctp_socket->so_qlimit) { 4061163953Srrs /* no space */ 4062163953Srrs struct mbuf *oper; 4063163953Srrs struct sctp_paramhdr *phdr; 4064163953Srrs 4065163953Srrs if (sctp_abort_if_one_2_one_hits_limit) { 4066163953Srrs oper = NULL; 4067163953Srrs oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4068165647Srrs 0, M_DONTWAIT, 1, MT_DATA); 4069163953Srrs if (oper) { 4070165647Srrs SCTP_BUF_LEN(oper) = 4071163953Srrs sizeof(struct sctp_paramhdr); 4072163953Srrs phdr = mtod(oper, 4073163953Srrs struct sctp_paramhdr *); 4074163953Srrs phdr->param_type = 4075163953Srrs htons(SCTP_CAUSE_OUT_OF_RESC); 4076163953Srrs phdr->param_length = 4077163953Srrs htons(sizeof(struct sctp_paramhdr)); 4078163953Srrs } 4079163953Srrs sctp_abort_association(inp, stcb, m, 4080163953Srrs iphlen, sh, oper); 4081163953Srrs } 4082163953Srrs *offset = length; 4083163953Srrs return (NULL); 4084163953Srrs } 4085163953Srrs } 4086163953Srrs process_cookie_anyway: 4087163953Srrs { 4088163953Srrs struct mbuf *ret_buf; 4089165220Srrs struct sctp_inpcb *linp; 4090163953Srrs 4091165220Srrs if (stcb) 4092165220Srrs linp = NULL; 4093165220Srrs else 4094165220Srrs linp = inp; 4095165220Srrs 4096165220Srrs if (linp) 4097165220Srrs SCTP_ASOC_CREATE_LOCK(linp); 4098163953Srrs ret_buf = 4099163953Srrs sctp_handle_cookie_echo(m, iphlen, 4100163953Srrs *offset, sh, 4101163953Srrs (struct sctp_cookie_echo_chunk *)ch, 4102163953Srrs &inp, &stcb, netp, 4103163953Srrs auth_skipped, 4104163953Srrs auth_offset, 4105165220Srrs auth_len, 4106165220Srrs &locked_tcb); 4107165220Srrs if (linp) 4108165220Srrs SCTP_ASOC_CREATE_UNLOCK(linp); 4109163953Srrs if (ret_buf == NULL) { 4110163953Srrs if (locked_tcb) { 4111163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 4112163953Srrs } 4113163953Srrs#ifdef SCTP_DEBUG 4114163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4115163953Srrs printf("GAK, null buffer\n"); 4116163953Srrs } 4117163953Srrs#endif /* SCTP_DEBUG */ 4118163953Srrs auth_skipped = 0; 4119163953Srrs *offset = length; 4120163953Srrs return (NULL); 4121163953Srrs } 4122163953Srrs /* if AUTH skipped, see if it verified... */ 4123163953Srrs if (auth_skipped) { 4124163953Srrs got_auth = 1; 4125163953Srrs auth_skipped = 0; 4126163953Srrs } 4127163953Srrs if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4128163953Srrs /* 4129163953Srrs * Restart the timer if we have 4130163953Srrs * pending data 4131163953Srrs */ 4132163953Srrs struct sctp_tmit_chunk *chk; 4133163953Srrs 4134163953Srrs chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4135163953Srrs if (chk) { 4136163953Srrs sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4137163953Srrs stcb->sctp_ep, stcb, 4138163953Srrs chk->whoTo); 4139163953Srrs } 4140163953Srrs } 4141163953Srrs } 4142163953Srrs break; 4143163953Srrs case SCTP_COOKIE_ACK: 4144163953Srrs#ifdef SCTP_DEBUG 4145163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4146163953Srrs printf("SCTP_COOKIE-ACK\n"); 4147163953Srrs } 4148163953Srrs#endif /* SCTP_DEBUG */ 4149163953Srrs 4150163953Srrs if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4151163953Srrs /* We are not interested anymore */ 4152163953Srrs if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4153163953Srrs ; 4154163953Srrs } else { 4155165220Srrs sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4156163953Srrs *offset = length; 4157163953Srrs return (NULL); 4158163953Srrs } 4159163953Srrs } 4160163953Srrs /* He's alive so give him credit */ 4161163953Srrs stcb->asoc.overall_error_count = 0; 4162163953Srrs sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4163163953Srrs break; 4164163953Srrs case SCTP_ECN_ECHO: 4165163953Srrs#ifdef SCTP_DEBUG 4166163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4167163953Srrs printf("SCTP_ECN-ECHO\n"); 4168163953Srrs } 4169163953Srrs#endif /* SCTP_DEBUG */ 4170163953Srrs /* He's alive so give him credit */ 4171163953Srrs stcb->asoc.overall_error_count = 0; 4172163953Srrs sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 4173163953Srrs stcb); 4174163953Srrs break; 4175163953Srrs case SCTP_ECN_CWR: 4176163953Srrs#ifdef SCTP_DEBUG 4177163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4178163953Srrs printf("SCTP_ECN-CWR\n"); 4179163953Srrs } 4180163953Srrs#endif /* SCTP_DEBUG */ 4181163953Srrs /* He's alive so give him credit */ 4182163953Srrs stcb->asoc.overall_error_count = 0; 4183163953Srrs 4184163953Srrs sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 4185163953Srrs break; 4186163953Srrs case SCTP_SHUTDOWN_COMPLETE: 4187163953Srrs#ifdef SCTP_DEBUG 4188163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4189163953Srrs printf("SCTP_SHUTDOWN-COMPLETE\n"); 4190163953Srrs } 4191163953Srrs#endif /* SCTP_DEBUG */ 4192163953Srrs /* must be first and only chunk */ 4193163953Srrs if ((num_chunks > 1) || 4194163953Srrs (length - *offset > SCTP_SIZE32(chk_length))) { 4195163953Srrs *offset = length; 4196163953Srrs if (locked_tcb) 4197163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 4198163953Srrs 4199163953Srrs return (NULL); 4200163953Srrs } 4201163953Srrs sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 4202163953Srrs stcb, *netp); 4203163953Srrs *offset = length; 4204163953Srrs return (NULL); 4205163953Srrs break; 4206163953Srrs case SCTP_ASCONF: 4207163953Srrs#ifdef SCTP_DEBUG 4208163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4209163953Srrs printf("SCTP_ASCONF\n"); 4210163953Srrs } 4211163953Srrs#endif /* SCTP_DEBUG */ 4212163953Srrs /* He's alive so give him credit */ 4213163953Srrs stcb->asoc.overall_error_count = 0; 4214163953Srrs 4215163953Srrs sctp_handle_asconf(m, *offset, 4216163953Srrs (struct sctp_asconf_chunk *)ch, stcb); 4217163953Srrs break; 4218163953Srrs case SCTP_ASCONF_ACK: 4219163953Srrs#ifdef SCTP_DEBUG 4220163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4221163953Srrs printf("SCTP_ASCONF-ACK\n"); 4222163953Srrs } 4223163953Srrs#endif /* SCTP_DEBUG */ 4224163953Srrs /* He's alive so give him credit */ 4225163953Srrs stcb->asoc.overall_error_count = 0; 4226163953Srrs 4227163953Srrs sctp_handle_asconf_ack(m, *offset, 4228163953Srrs (struct sctp_asconf_ack_chunk *)ch, stcb, *netp); 4229163953Srrs break; 4230163953Srrs case SCTP_FORWARD_CUM_TSN: 4231163953Srrs#ifdef SCTP_DEBUG 4232163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4233163953Srrs printf("SCTP_FWD-TSN\n"); 4234163953Srrs } 4235163953Srrs#endif /* SCTP_DEBUG */ 4236163953Srrs /* He's alive so give him credit */ 4237163953Srrs { 4238163953Srrs int abort_flag = 0; 4239163953Srrs 4240163953Srrs stcb->asoc.overall_error_count = 0; 4241163953Srrs *fwd_tsn_seen = 1; 4242163953Srrs if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4243163953Srrs /* We are not interested anymore */ 4244165220Srrs sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 4245163953Srrs *offset = length; 4246163953Srrs return (NULL); 4247163953Srrs } 4248163953Srrs sctp_handle_forward_tsn(stcb, 4249163953Srrs (struct sctp_forward_tsn_chunk *)ch, &abort_flag); 4250163953Srrs if (abort_flag) { 4251163953Srrs *offset = length; 4252163953Srrs return (NULL); 4253163953Srrs } else { 4254163953Srrs stcb->asoc.overall_error_count = 0; 4255163953Srrs } 4256163953Srrs 4257163953Srrs } 4258163953Srrs break; 4259163953Srrs case SCTP_STREAM_RESET: 4260163953Srrs#ifdef SCTP_DEBUG 4261163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4262163953Srrs printf("SCTP_STREAM_RESET\n"); 4263163953Srrs } 4264163953Srrs#endif /* SCTP_DEBUG */ 4265163953Srrs ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4266163953Srrs chk_length, chunk_buf); 4267163953Srrs if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4268163953Srrs /* We are not interested anymore */ 4269165220Srrs sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4270163953Srrs *offset = length; 4271163953Srrs return (NULL); 4272163953Srrs } 4273163953Srrs if (stcb->asoc.peer_supports_strreset == 0) { 4274163953Srrs /* 4275163953Srrs * hmm, peer should have announced this, but 4276163953Srrs * we will turn it on since he is sending us 4277163953Srrs * a stream reset. 4278163953Srrs */ 4279163953Srrs stcb->asoc.peer_supports_strreset = 1; 4280163953Srrs } 4281163953Srrs if (sctp_handle_stream_reset(stcb, (struct sctp_stream_reset_out_req *)ch)) { 4282163953Srrs /* stop processing */ 4283163953Srrs *offset = length; 4284163953Srrs return (NULL); 4285163953Srrs } 4286163953Srrs break; 4287163953Srrs case SCTP_PACKET_DROPPED: 4288163953Srrs#ifdef SCTP_DEBUG 4289163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4290163953Srrs printf("SCTP_PACKET_DROPPED\n"); 4291163953Srrs } 4292163953Srrs#endif /* SCTP_DEBUG */ 4293163953Srrs /* re-get it all please */ 4294163953Srrs ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4295163953Srrs chk_length, chunk_buf); 4296163953Srrs 4297163953Srrs sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 4298163953Srrs stcb, *netp); 4299163953Srrs 4300163953Srrs break; 4301163953Srrs 4302163953Srrs case SCTP_AUTHENTICATION: 4303163953Srrs#ifdef SCTP_DEBUG 4304163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4305163953Srrs printf("SCTP_AUTHENTICATION\n"); 4306163953Srrs } 4307163953Srrs#endif /* SCTP_DEBUG */ 4308163953Srrs if (sctp_auth_disable) 4309163953Srrs goto unknown_chunk; 4310163953Srrs 4311163953Srrs if (stcb == NULL) { 4312163953Srrs /* save the first AUTH for later processing */ 4313163953Srrs if (auth_skipped == 0) { 4314163953Srrs auth_offset = *offset; 4315163953Srrs auth_len = chk_length; 4316163953Srrs auth_skipped = 1; 4317163953Srrs } 4318163953Srrs /* skip this chunk (temporarily) */ 4319163953Srrs goto next_chunk; 4320163953Srrs } 4321163953Srrs if (got_auth == 1) { 4322163953Srrs /* skip this chunk... it's already auth'd */ 4323163953Srrs goto next_chunk; 4324163953Srrs } 4325163953Srrs ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4326163953Srrs chk_length, chunk_buf); 4327163953Srrs got_auth = 1; 4328163953Srrs if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 4329163953Srrs m, *offset)) { 4330163953Srrs /* auth HMAC failed so dump the packet */ 4331163953Srrs *offset = length; 4332163953Srrs return (stcb); 4333163953Srrs } else { 4334163953Srrs /* remaining chunks are HMAC checked */ 4335163953Srrs stcb->asoc.authenticated = 1; 4336163953Srrs } 4337163953Srrs break; 4338163953Srrs 4339163953Srrs default: 4340163953Srrs unknown_chunk: 4341163953Srrs /* it's an unknown chunk! */ 4342163953Srrs if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 4343163953Srrs struct mbuf *mm; 4344163953Srrs struct sctp_paramhdr *phd; 4345163953Srrs 4346163953Srrs mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4347165647Srrs 0, M_DONTWAIT, 1, MT_DATA); 4348163953Srrs if (mm) { 4349163953Srrs phd = mtod(mm, struct sctp_paramhdr *); 4350163953Srrs /* 4351163953Srrs * We cheat and use param type since 4352163953Srrs * we did not bother to define a 4353163953Srrs * error cause struct. They are the 4354163953Srrs * same basic format with different 4355163953Srrs * names. 4356163953Srrs */ 4357163953Srrs phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 4358163953Srrs phd->param_length = htons(chk_length + sizeof(*phd)); 4359165647Srrs SCTP_BUF_LEN(mm) = sizeof(*phd); 4360166023Srrs SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 4361163953Srrs M_DONTWAIT); 4362165647Srrs if (SCTP_BUF_NEXT(mm)) { 4363163953Srrs sctp_queue_op_err(stcb, mm); 4364163953Srrs } else { 4365163953Srrs sctp_m_freem(mm); 4366163953Srrs } 4367163953Srrs } 4368163953Srrs } 4369163953Srrs if ((ch->chunk_type & 0x80) == 0) { 4370163953Srrs /* discard this packet */ 4371163953Srrs *offset = length; 4372163953Srrs return (stcb); 4373163953Srrs } /* else skip this bad chunk and continue... */ 4374163953Srrs break; 4375163953Srrs } /* switch (ch->chunk_type) */ 4376163953Srrs 4377163953Srrs 4378163953Srrsnext_chunk: 4379163953Srrs /* get the next chunk */ 4380163953Srrs *offset += SCTP_SIZE32(chk_length); 4381163953Srrs if (*offset >= length) { 4382163953Srrs /* no more data left in the mbuf chain */ 4383163953Srrs break; 4384163953Srrs } 4385163953Srrs ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4386163953Srrs sizeof(struct sctp_chunkhdr), chunk_buf); 4387163953Srrs if (ch == NULL) { 4388163953Srrs if (locked_tcb) 4389163953Srrs SCTP_TCB_UNLOCK(locked_tcb); 4390163953Srrs *offset = length; 4391163953Srrs return (NULL); 4392163953Srrs } 4393163953Srrs } /* while */ 4394163953Srrs return (stcb); 4395163953Srrs} 4396163953Srrs 4397163953Srrs 4398163953Srrs/* 4399163953Srrs * Process the ECN bits we have something set so we must look to see if it is 4400163953Srrs * ECN(0) or ECN(1) or CE 4401163953Srrs */ 4402163953Srrsstatic __inline void 4403163953Srrssctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 4404163953Srrs uint8_t ecn_bits) 4405163953Srrs{ 4406163953Srrs if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4407163953Srrs ; 4408163953Srrs } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 4409163953Srrs /* 4410163953Srrs * we only add to the nonce sum for ECT1, ECT0 does not 4411163953Srrs * change the NS bit (that we have yet to find a way to send 4412163953Srrs * it yet). 4413163953Srrs */ 4414163953Srrs 4415163953Srrs /* ECN Nonce stuff */ 4416163953Srrs stcb->asoc.receiver_nonce_sum++; 4417163953Srrs stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 4418163953Srrs 4419163953Srrs /* 4420163953Srrs * Drag up the last_echo point if cumack is larger since we 4421163953Srrs * don't want the point falling way behind by more than 4422163953Srrs * 2^^31 and then having it be incorrect. 4423163953Srrs */ 4424163953Srrs if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4425163953Srrs stcb->asoc.last_echo_tsn, MAX_TSN)) { 4426163953Srrs stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4427163953Srrs } 4428163953Srrs } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 4429163953Srrs /* 4430163953Srrs * Drag up the last_echo point if cumack is larger since we 4431163953Srrs * don't want the point falling way behind by more than 4432163953Srrs * 2^^31 and then having it be incorrect. 4433163953Srrs */ 4434163953Srrs if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4435163953Srrs stcb->asoc.last_echo_tsn, MAX_TSN)) { 4436163953Srrs stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4437163953Srrs } 4438163953Srrs } 4439163953Srrs} 4440163953Srrs 4441163953Srrsstatic __inline void 4442163953Srrssctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 4443163953Srrs uint32_t high_tsn, uint8_t ecn_bits) 4444163953Srrs{ 4445163953Srrs if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4446163953Srrs /* 4447163953Srrs * we possibly must notify the sender that a congestion 4448163953Srrs * window reduction is in order. We do this by adding a ECNE 4449163953Srrs * chunk to the output chunk queue. The incoming CWR will 4450163953Srrs * remove this chunk. 4451163953Srrs */ 4452163953Srrs if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 4453163953Srrs MAX_TSN)) { 4454163953Srrs /* Yep, we need to add a ECNE */ 4455163953Srrs sctp_send_ecn_echo(stcb, net, high_tsn); 4456163953Srrs stcb->asoc.last_echo_tsn = high_tsn; 4457163953Srrs } 4458163953Srrs } 4459163953Srrs} 4460163953Srrs 4461163953Srrs/* 4462163953Srrs * common input chunk processing (v4 and v6) 4463163953Srrs */ 4464163953Srrsint 4465163953Srrssctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 4466163953Srrs int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 4467163953Srrs struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 4468163953Srrs uint8_t ecn_bits) 4469163953Srrs{ 4470163953Srrs /* 4471163953Srrs * Control chunk processing 4472163953Srrs */ 4473163953Srrs uint32_t high_tsn; 4474163953Srrs int fwd_tsn_seen = 0, data_processed = 0; 4475163953Srrs struct mbuf *m = *mm; 4476163953Srrs int abort_flag = 0; 4477163953Srrs int un_sent; 4478163953Srrs 4479163953Srrs SCTP_STAT_INCR(sctps_recvdatagrams); 4480163953Srrs#ifdef SCTP_AUDITING_ENABLED 4481163953Srrs sctp_audit_log(0xE0, 1); 4482163953Srrs sctp_auditing(0, inp, stcb, net); 4483163953Srrs#endif 4484163953Srrs 4485163953Srrs#ifdef SCTP_DEBUG 4486163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4487163996Srrs printf("Ok, Common input processing called, m:%p iphlen:%d offset:%d\n", 4488163996Srrs m, iphlen, offset); 4489163953Srrs } 4490163953Srrs#endif /* SCTP_DEBUG */ 4491163953Srrs 4492163953Srrs if (stcb) { 4493163953Srrs /* always clear this before beginning a packet */ 4494163953Srrs stcb->asoc.authenticated = 0; 4495163953Srrs stcb->asoc.seen_a_sack_this_pkt = 0; 4496163953Srrs } 4497163953Srrs if (IS_SCTP_CONTROL(ch)) { 4498163953Srrs /* process the control portion of the SCTP packet */ 4499163953Srrs stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 4500163953Srrs inp, stcb, &net, &fwd_tsn_seen); 4501163953Srrs if (stcb) { 4502163953Srrs /* 4503163953Srrs * This covers us if the cookie-echo was there and 4504163953Srrs * it changes our INP. 4505163953Srrs */ 4506163953Srrs inp = stcb->sctp_ep; 4507163953Srrs } 4508163953Srrs } else { 4509163953Srrs /* 4510163953Srrs * no control chunks, so pre-process DATA chunks (these 4511163953Srrs * checks are taken care of by control processing) 4512163953Srrs */ 4513163953Srrs 4514163953Srrs /* 4515163953Srrs * if DATA only packet, and auth is required, then punt... 4516163953Srrs * can't have authenticated without any AUTH (control) 4517163953Srrs * chunks 4518163953Srrs */ 4519163953Srrs if ((stcb != NULL) && !sctp_auth_disable && 4520163953Srrs sctp_auth_is_required_chunk(SCTP_DATA, 4521163953Srrs stcb->asoc.local_auth_chunks)) { 4522163953Srrs /* "silently" ignore */ 4523163953Srrs SCTP_STAT_INCR(sctps_recvauthmissing); 4524163953Srrs SCTP_TCB_UNLOCK(stcb); 4525163953Srrs return (1); 4526163953Srrs } 4527163953Srrs if (stcb == NULL) { 4528163953Srrs /* out of the blue DATA chunk */ 4529163953Srrs sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL); 4530163953Srrs return (1); 4531163953Srrs } 4532163953Srrs if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 4533163953Srrs /* v_tag mismatch! */ 4534163953Srrs SCTP_STAT_INCR(sctps_badvtag); 4535163953Srrs SCTP_TCB_UNLOCK(stcb); 4536163953Srrs return (1); 4537163953Srrs } 4538163953Srrs } 4539163953Srrs 4540163953Srrs if (stcb == NULL) { 4541163953Srrs /* 4542163953Srrs * no valid TCB for this packet, or we found it's a bad 4543163953Srrs * packet while processing control, or we're done with this 4544163953Srrs * packet (done or skip rest of data), so we drop it... 4545163953Srrs */ 4546163953Srrs return (1); 4547163953Srrs } 4548163953Srrs /* 4549163953Srrs * DATA chunk processing 4550163953Srrs */ 4551163953Srrs /* plow through the data chunks while length > offset */ 4552163953Srrs 4553163953Srrs /* 4554163953Srrs * Rest should be DATA only. Check authentication state if AUTH for 4555163953Srrs * DATA is required. 4556163953Srrs */ 4557165220Srrs if ((length > offset) && (stcb != NULL) && !sctp_auth_disable && 4558163953Srrs sctp_auth_is_required_chunk(SCTP_DATA, 4559163953Srrs stcb->asoc.local_auth_chunks) && 4560163953Srrs !stcb->asoc.authenticated) { 4561163953Srrs /* "silently" ignore */ 4562163953Srrs SCTP_STAT_INCR(sctps_recvauthmissing); 4563163953Srrs#ifdef SCTP_DEBUG 4564163953Srrs if (sctp_debug_on & SCTP_DEBUG_AUTH1) 4565163953Srrs printf("Data chunk requires AUTH, skipped\n"); 4566163953Srrs#endif 4567165220Srrs goto trigger_send; 4568163953Srrs } 4569163953Srrs if (length > offset) { 4570163953Srrs int retval; 4571163953Srrs 4572163953Srrs /* 4573163953Srrs * First check to make sure our state is correct. We would 4574163953Srrs * not get here unless we really did have a tag, so we don't 4575163953Srrs * abort if this happens, just dump the chunk silently. 4576163953Srrs */ 4577163953Srrs switch (SCTP_GET_STATE(&stcb->asoc)) { 4578163953Srrs case SCTP_STATE_COOKIE_ECHOED: 4579163953Srrs /* 4580163953Srrs * we consider data with valid tags in this state 4581163953Srrs * shows us the cookie-ack was lost. Imply it was 4582163953Srrs * there. 4583163953Srrs */ 4584163953Srrs stcb->asoc.overall_error_count = 0; 4585163953Srrs sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 4586163953Srrs break; 4587163953Srrs case SCTP_STATE_COOKIE_WAIT: 4588163953Srrs /* 4589163953Srrs * We consider OOTB any data sent during asoc setup. 4590163953Srrs */ 4591163953Srrs sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL); 4592163953Srrs SCTP_TCB_UNLOCK(stcb); 4593163953Srrs return (1); 4594163953Srrs break; 4595163953Srrs case SCTP_STATE_EMPTY: /* should not happen */ 4596163953Srrs case SCTP_STATE_INUSE: /* should not happen */ 4597163953Srrs case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 4598163953Srrs case SCTP_STATE_SHUTDOWN_ACK_SENT: 4599163953Srrs default: 4600163953Srrs SCTP_TCB_UNLOCK(stcb); 4601163953Srrs return (1); 4602163953Srrs break; 4603163953Srrs case SCTP_STATE_OPEN: 4604163953Srrs case SCTP_STATE_SHUTDOWN_SENT: 4605163953Srrs break; 4606163953Srrs } 4607163953Srrs /* take care of ECN, part 1. */ 4608163953Srrs if (stcb->asoc.ecn_allowed && 4609163953Srrs (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4610163953Srrs sctp_process_ecn_marked_a(stcb, net, ecn_bits); 4611163953Srrs } 4612163953Srrs /* plow through the data chunks while length > offset */ 4613163953Srrs retval = sctp_process_data(mm, iphlen, &offset, length, sh, 4614163953Srrs inp, stcb, net, &high_tsn); 4615163953Srrs if (retval == 2) { 4616163953Srrs /* 4617163953Srrs * The association aborted, NO UNLOCK needed since 4618163953Srrs * the association is destroyed. 4619163953Srrs */ 4620163953Srrs return (0); 4621163953Srrs } 4622163953Srrs data_processed = 1; 4623163953Srrs if (retval == 0) { 4624163953Srrs /* take care of ecn part 2. */ 4625163953Srrs if (stcb->asoc.ecn_allowed && 4626163953Srrs (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4627163953Srrs sctp_process_ecn_marked_b(stcb, net, high_tsn, 4628163953Srrs ecn_bits); 4629163953Srrs } 4630163953Srrs } 4631163953Srrs /* 4632163953Srrs * Anything important needs to have been m_copy'ed in 4633163953Srrs * process_data 4634163953Srrs */ 4635163953Srrs } 4636163953Srrs if ((data_processed == 0) && (fwd_tsn_seen)) { 4637163953Srrs int was_a_gap = 0; 4638163953Srrs 4639163953Srrs if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 4640163953Srrs stcb->asoc.cumulative_tsn, MAX_TSN)) { 4641163953Srrs /* there was a gap before this data was processed */ 4642163953Srrs was_a_gap = 1; 4643163953Srrs } 4644163953Srrs sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 4645163953Srrs if (abort_flag) { 4646163953Srrs /* Again, we aborted so NO UNLOCK needed */ 4647163953Srrs return (0); 4648163953Srrs } 4649163953Srrs } 4650163953Srrs /* trigger send of any chunks in queue... */ 4651165220Srrstrigger_send: 4652163953Srrs#ifdef SCTP_AUDITING_ENABLED 4653163953Srrs sctp_audit_log(0xE0, 2); 4654163953Srrs sctp_auditing(1, inp, stcb, net); 4655163953Srrs#endif 4656163953Srrs#ifdef SCTP_DEBUG 4657163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4658163953Srrs printf("Check for chunk output prw:%d tqe:%d tf=%d\n", 4659163953Srrs stcb->asoc.peers_rwnd, 4660163953Srrs TAILQ_EMPTY(&stcb->asoc.control_send_queue), 4661163953Srrs stcb->asoc.total_flight); 4662163953Srrs } 4663163953Srrs#endif 4664163953Srrs un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 4665163953Srrs 4666163953Srrs if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 4667163953Srrs ((un_sent) && 4668163953Srrs (stcb->asoc.peers_rwnd > 0 || 4669163953Srrs (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 4670163953Srrs#ifdef SCTP_DEBUG 4671163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4672163953Srrs printf("Calling chunk OUTPUT\n"); 4673163953Srrs } 4674163953Srrs#endif 4675163953Srrs sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 4676163953Srrs#ifdef SCTP_DEBUG 4677163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT3) { 4678163953Srrs printf("chunk OUTPUT returns\n"); 4679163953Srrs } 4680163953Srrs#endif 4681163953Srrs } 4682163953Srrs#ifdef SCTP_AUDITING_ENABLED 4683163953Srrs sctp_audit_log(0xE0, 3); 4684163953Srrs sctp_auditing(2, inp, stcb, net); 4685163953Srrs#endif 4686163953Srrs SCTP_TCB_UNLOCK(stcb); 4687163953Srrs return (0); 4688163953Srrs} 4689163953Srrs 4690163953Srrs 4691163953Srrs 4692163953Srrsvoid 4693165647Srrssctp_input(i_pak, off) 4694165647Srrs struct mbuf *i_pak; 4695163953Srrs int off; 4696163953Srrs 4697163953Srrs{ 4698163953Srrs#ifdef SCTP_MBUF_LOGGING 4699163953Srrs struct mbuf *mat; 4700163953Srrs 4701163953Srrs#endif 4702165647Srrs struct mbuf *m; 4703163953Srrs int iphlen; 4704168299Srrs uint32_t vrf_id; 4705163953Srrs uint8_t ecn_bits; 4706163953Srrs struct ip *ip; 4707163953Srrs struct sctphdr *sh; 4708163953Srrs struct sctp_inpcb *inp = NULL; 4709163953Srrs 4710163953Srrs uint32_t check, calc_check; 4711163953Srrs struct sctp_nets *net; 4712163953Srrs struct sctp_tcb *stcb = NULL; 4713163953Srrs struct sctp_chunkhdr *ch; 4714163953Srrs int refcount_up = 0; 4715163953Srrs int length, mlen, offset; 4716163953Srrs 4717168299Srrs vrf_id = SCTP_DEFAULT_VRFID; 4718168299Srrs mlen = SCTP_HEADER_LEN(i_pak); 4719163953Srrs iphlen = off; 4720165647Srrs m = SCTP_HEADER_TO_CHAIN(i_pak); 4721163953Srrs net = NULL; 4722163953Srrs SCTP_STAT_INCR(sctps_recvpackets); 4723163953Srrs SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 4724163953Srrs 4725163953Srrs#ifdef SCTP_MBUF_LOGGING 4726163953Srrs /* Log in any input mbufs */ 4727163953Srrs mat = m; 4728163953Srrs while (mat) { 4729165647Srrs if (SCTP_BUF_IS_EXTENDED(mat)) { 4730163953Srrs sctp_log_mb(mat, SCTP_MBUF_INPUT); 4731163953Srrs } 4732165647Srrs mat = SCTP_BUF_NEXT(mat); 4733163953Srrs } 4734163953Srrs#endif 4735168124Srrs 4736163953Srrs /* 4737163953Srrs * Get IP, SCTP, and first chunk header together in first mbuf. 4738163953Srrs */ 4739163953Srrs ip = mtod(m, struct ip *); 4740163953Srrs offset = iphlen + sizeof(*sh) + sizeof(*ch); 4741165647Srrs if (SCTP_BUF_LEN(m) < offset) { 4742163953Srrs if ((m = m_pullup(m, offset)) == 0) { 4743163953Srrs SCTP_STAT_INCR(sctps_hdrops); 4744163953Srrs return; 4745163953Srrs } 4746163953Srrs ip = mtod(m, struct ip *); 4747163953Srrs } 4748163953Srrs sh = (struct sctphdr *)((caddr_t)ip + iphlen); 4749163953Srrs ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 4750163953Srrs 4751163953Srrs /* SCTP does not allow broadcasts or multicasts */ 4752163953Srrs if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 4753163953Srrs goto bad; 4754163953Srrs } 4755168124Srrs if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 4756163953Srrs /* 4757163953Srrs * We only look at broadcast if its a front state, All 4758163953Srrs * others we will not have a tcb for anyway. 4759163953Srrs */ 4760163953Srrs goto bad; 4761163953Srrs } 4762163953Srrs /* validate SCTP checksum */ 4763168124Srrs if ((sctp_no_csum_on_loopback == 0) || !SCTP_IS_IT_LOOPBACK(m)) { 4764163953Srrs /* 4765163953Srrs * we do NOT validate things from the loopback if the sysctl 4766163953Srrs * is set to 1. 4767163953Srrs */ 4768163953Srrs check = sh->checksum; /* save incoming checksum */ 4769163953Srrs if ((check == 0) && (sctp_no_csum_on_loopback)) { 4770163953Srrs /* 4771163953Srrs * special hook for where we got a local address 4772163953Srrs * somehow routed across a non IFT_LOOP type 4773163953Srrs * interface 4774163953Srrs */ 4775163953Srrs if (ip->ip_src.s_addr == ip->ip_dst.s_addr) 4776163953Srrs goto sctp_skip_csum_4; 4777163953Srrs } 4778163953Srrs sh->checksum = 0; /* prepare for calc */ 4779163953Srrs calc_check = sctp_calculate_sum(m, &mlen, iphlen); 4780163953Srrs if (calc_check != check) { 4781163953Srrs#ifdef SCTP_DEBUG 4782163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4783163996Srrs printf("Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 4784163996Srrs calc_check, check, m, mlen, iphlen); 4785163953Srrs } 4786163953Srrs#endif 4787163953Srrs 4788163953Srrs stcb = sctp_findassociation_addr(m, iphlen, 4789163953Srrs offset - sizeof(*ch), 4790168299Srrs sh, ch, &inp, &net, vrf_id); 4791163953Srrs if ((inp) && (stcb)) { 4792163953Srrs sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 4793163953Srrs sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR); 4794163953Srrs } else if ((inp != NULL) && (stcb == NULL)) { 4795163953Srrs refcount_up = 1; 4796163953Srrs } 4797163953Srrs SCTP_STAT_INCR(sctps_badsum); 4798163953Srrs SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 4799163953Srrs goto bad; 4800163953Srrs } 4801163953Srrs sh->checksum = calc_check; 4802168299Srrs } 4803163953Srrssctp_skip_csum_4: 4804168124Srrs /* destination port of 0 is illegal, based on RFC2960. */ 4805168124Srrs if (sh->dest_port == 0) { 4806168124Srrs SCTP_STAT_INCR(sctps_hdrops); 4807168124Srrs goto bad; 4808168124Srrs } 4809163953Srrs /* validate mbuf chain length with IP payload length */ 4810163953Srrs if (mlen < (ip->ip_len - iphlen)) { 4811163953Srrs SCTP_STAT_INCR(sctps_hdrops); 4812163953Srrs goto bad; 4813163953Srrs } 4814163953Srrs /* 4815163953Srrs * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 4816163953Srrs * IP/SCTP/first chunk header... 4817163953Srrs */ 4818163953Srrs stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 4819168299Srrs sh, ch, &inp, &net, vrf_id); 4820163953Srrs /* inp's ref-count increased && stcb locked */ 4821163953Srrs if (inp == NULL) { 4822163953Srrs struct sctp_init_chunk *init_chk, chunk_buf; 4823163953Srrs 4824163953Srrs SCTP_STAT_INCR(sctps_noport); 4825163953Srrs#ifdef ICMP_BANDLIM 4826163953Srrs /* 4827163953Srrs * we use the bandwidth limiting to protect against sending 4828163953Srrs * too many ABORTS all at once. In this case these count the 4829163953Srrs * same as an ICMP message. 4830163953Srrs */ 4831163953Srrs if (badport_bandlim(0) < 0) 4832163953Srrs goto bad; 4833163953Srrs#endif /* ICMP_BANDLIM */ 4834163953Srrs#ifdef SCTP_DEBUG 4835163953Srrs if (sctp_debug_on & SCTP_DEBUG_INPUT1) { 4836163953Srrs printf("Sending a ABORT from packet entry!\n"); 4837163953Srrs } 4838163953Srrs#endif 4839163953Srrs if (ch->chunk_type == SCTP_INITIATION) { 4840163953Srrs /* 4841163953Srrs * we do a trick here to get the INIT tag, dig in 4842163953Srrs * and get the tag from the INIT and put it in the 4843163953Srrs * common header. 4844163953Srrs */ 4845163953Srrs init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 4846163953Srrs iphlen + sizeof(*sh), sizeof(*init_chk), 4847163953Srrs (uint8_t *) & chunk_buf); 4848163953Srrs if (init_chk != NULL) 4849163953Srrs sh->v_tag = init_chk->init.initiate_tag; 4850163953Srrs } 4851165220Srrs if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4852165220Srrs sctp_send_shutdown_complete2(m, iphlen, sh); 4853165220Srrs goto bad; 4854165220Srrs } 4855165220Srrs if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 4856165220Srrs goto bad; 4857165220Srrs } 4858165220Srrs if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 4859165220Srrs sctp_send_abort(m, iphlen, sh, 0, NULL); 4860163953Srrs goto bad; 4861163953Srrs } else if (stcb == NULL) { 4862163953Srrs refcount_up = 1; 4863163953Srrs } 4864163953Srrs#ifdef IPSEC 4865163953Srrs /* 4866163953Srrs * I very much doubt any of the IPSEC stuff will work but I have no 4867163953Srrs * idea, so I will leave it in place. 4868163953Srrs */ 4869163953Srrs 4870163996Srrs if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 4871163953Srrs ipsecstat.in_polvio++; 4872163953Srrs SCTP_STAT_INCR(sctps_hdrops); 4873163953Srrs goto bad; 4874163953Srrs } 4875163953Srrs#endif /* IPSEC */ 4876163953Srrs 4877163953Srrs /* 4878163953Srrs * common chunk processing 4879163953Srrs */ 4880163953Srrs length = ip->ip_len + iphlen; 4881163953Srrs offset -= sizeof(struct sctp_chunkhdr); 4882163953Srrs 4883163953Srrs ecn_bits = ip->ip_tos; 4884163953Srrs 4885163953Srrs sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 4886163953Srrs inp, stcb, net, ecn_bits); 4887163953Srrs /* inp's ref-count reduced && stcb unlocked */ 4888163953Srrs if (m) { 4889163953Srrs sctp_m_freem(m); 4890163953Srrs } 4891163953Srrs if ((inp) && (refcount_up)) { 4892163953Srrs /* reduce ref-count */ 4893163953Srrs SCTP_INP_WLOCK(inp); 4894163953Srrs SCTP_INP_DECR_REF(inp); 4895163953Srrs SCTP_INP_WUNLOCK(inp); 4896163953Srrs } 4897163953Srrs return; 4898163953Srrsbad: 4899163953Srrs if (stcb) 4900163953Srrs SCTP_TCB_UNLOCK(stcb); 4901163953Srrs 4902163953Srrs if ((inp) && (refcount_up)) { 4903163953Srrs /* reduce ref-count */ 4904163953Srrs SCTP_INP_WLOCK(inp); 4905163953Srrs SCTP_INP_DECR_REF(inp); 4906163953Srrs SCTP_INP_WUNLOCK(inp); 4907163953Srrs } 4908163953Srrs if (m) { 4909163953Srrs sctp_m_freem(m); 4910163953Srrs } 4911163953Srrs return; 4912163953Srrs} 4913